# BOSTON REED. Clinical Medical Assistant Program Math Review Handout. Addition... Page 2. Subtraction... Page 3. Multiplication...

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1 BOSTON REED Clinical Medical Assistant Program Math Review Handout Contents Addition... Page 2 Subtraction... Page 3 Multiplication... Page 4 Decimals... Page 5 Decimal Practice Math... Page 7 Fractions... Page 8 Fraction Practice Math... Page 15 Percentages... Page 16 Percentage Practice Math... Page 17 Math Answers... Page 18 More Math Practice... Page 19 Answers for More Math Practice... Page 20 Math Formulas for Dose Calculations... Page 21 Medication Dose By Weight... Page 26 Conversion Practice Worksheet... Page 27 Dose Calculation Practice Worksheet... Page 28 Practice Worksheet Answers... Page 29

2 Addition of 3 Numbers Add the numbers in the ones column. Add the first two numbers = 11. Add the third number =15 2. Add the numbers in the tens column. Don t forget the 1 carried over from the ones column = 4. Add the third number, = Page 2

3 Subtracting Three-Digit Numbers Hundreds Tens Ones Hundreds Tens Ones Hundreds Tens Ones Subtract the numbers in the ones column. 8-9 cannot be done. Rename 8 to 18 by borrowing from the 1 in the tens column. 2. Subtract the numbers in the tens column, remember the 1 is gone. 0 0 = 0 3. Subtract the numbers in the hundreds column. 6 2 = Page 3

4 Multiplying Three-Digit Numbers by One Digit 128 x x x Multiply the number in the ones column by 4. 4 x 8 = 32. Carry the 3 over to the tens column 2. Multiply the number in the tens column by 4. 4 x 2 = = 11 tens. Carry the one to the hundreths column. 3. Multiply the number in the hundreds column by 4. 4 x 1 +1= 5 Multiply to find the product in each problem. 318 x3 164 x5 408 x6 237 x x x x x x 6 Page 4

5 Math Review for Decimals General Rules for Addition, Subtraction, Multiplication, & Division of Decimals When you have a whole number that does not have a decimal, place the decimal after the last number on the right. Added zeros are underlined in these examples. Example: Whole number: 32 Change to: 32.0 You may add zeros after the decimal or after the last number that is to the right of the decimal if you need a placeholder. Example: Whole number: 12.6 Change to: Additional Rules for Addition & Subtraction of Decimals Always line up the decimal points for each number, as shown in the problems below. Addition Problem: = Rewrite: Add columns starting on the right. Work from the top down. Subtraction Problem: = Rewrite: Subtract columns starting on the right. Remember to borrow from the number to the left if needed. Page 5

6 MATH REVIEW FOR DECIMALS Additional Rules for Multiplication of Decimals Multiply the numbers together first. Then to find the correct decimal placement for your answer, count the numbers after the decimal point from left to right in the problem. Counting L R from The decimals do not need to be lined up for multiplication. the decimal point = 2 places 22.1 = 1 place Example Total of 3 places x When you have the answer count R L the same number of places to find where the decimal belongs Additional Rules for Division of Decimals: Remember that if you see = you would say it like divided by 2.2 (not divided into). The number after the ( divided by ) would go on the outside of the division box. If a decimal is present in the number on the outside of the box, you must move it all the way to the right. Count the number of places as you move it. Then move the decimal for the number inside the box. Move it to the right the exact number of places as you did with the first number. The decimal for the answer goes directly above the decimal inside the box. Write the problem like this Move the decimal points. Do the math (Divide). Step One: First move the decimal in the number on the outside of the box from L R. How many spaces or numbers did we move the decimal here? 2.2 =1 space Step Two: Then move the decimal point inside the box the same number of spaces from L R. 1 space so becomes Step Three: The decimal point in the answer is immediately above the decimal point in the box. Page 6

7 Decimals Practice Sheet Complete each math problem and then correct each question as you go along. Tip#1: By correcting each problem as you complete it, you will reinforce good math habits and immediately discover problem areas rather than repeating any habitual error with other problems. Tip#2: If you have problems keeping your columns in line or in lining up your decimals, use graph paper to do your addition, subtraction, and division = = = = = = x 7.6 = x 9.3 = x 0.06 = x 0.6 = = = = = = Page 7

8 Instruction for Fractions Whole number is the 2 2 Numerator is the 1 Denominator is the 3 Common Terms Mixed Fraction: A number that has a whole number and a fraction Improper Fraction: A fraction that has a numerator larger than the denominator Removing The Whole Number From A Mixed Fraction: FORMULA: W# D + N = New N Example: = Whole number (W#) = 2 Numerator (N) = 1 Denominator (D) =3 1 N 2 3 = W# D 1 Formula W# D + N = NewN 2 3 = Working the Problem = 7 Final answer is: New Numerator 7 = Old Denominator 3 Explanation: When you have a fraction that has a whole number, get rid of the whole number prior to actually working the problem (Follow steps below). Steps: 1. Multiply the whole number (W#) by the denominator (D) 2. Then add the numerator (N). 3. The answer for step 2 is the New N (top number in your fraction). 4. Place the old denominator (bottom number) under the new N as shown in the example above. 5. Now do the math (addition, subtraction, multiplication or division). Page 8

9 How To Find The Lowest Common Denominator (LCD) Rule: When adding or subtracting with fractions you must have the same denominator for each fraction before adding/subtracting. *** *** *** To find the number that will become the new denominator you should ask what is the lowest number that all denominators divide into evenly? Example: What is the lowest number that both 4 and 5 go into equally? (answer-20) EXAMPLE OF FINDING THE LOWEST COMMON DENOMINATOR (Shown vertically, but may be done horizontally) What number do both 4 and 5 go into evenly? Answer: 20 What number do we have to multiply 5 by to get 20? Answer: 4 What number do we have to multiply 4 by to get 20? Answer: = = Solving the same problem (Shown horizontally, but may be done vertically) = Rule: When multiplying the denominator by a number to find a common denominator, you must also multiply the numerator by that same number so that the value of the fraction does not change * Dashed boxes around fraction indicate the number is from the original problem Page 9

10 Making A Mixed Fraction From An Improper Fraction: Example #1: You will want to take the top number (N) and divide it by the bottom number (D). Do not add a decimal! Use your remainder to become the new numerator. If your answer is: Divide like this: New whole number - 9 Same bottom number Denominator- 3 New top number- Numerator- 1 You would write your final answer like this: 28 3 = Finding The Common Factor So That You Can Reduce To Lowest Terms : Steps: 1. Factor both the N and the D. 2. Find the common factor, the one that both numbers can be divided by. 3. Divide each number by the factor. 4. Check answer to see if it can be factored out further. Are there no other common factors left? Example: If you have an answer of: 5 25 Find the common factor. Divide each number by the same factor chosen. The factors of 5 are 1, 5: = The factors of 25 are 1, 5, 25: In this example the number 5 can be divided into both numbers. Divide each number by 5 and that will give you the answer in the lowest terms (reduced). Page 10

11 ADDITION AND SUBTRACTION: Rules: 1. If you have a mixed fraction, change to an improper fraction 2. Find the Lowest Common Denominator. 3. Add the top numbers (N) to get a new N. 4. Keep the old bottom number (D). 5. Reduce to the lowest terms. Example of Addition: Addition = Step 1 Get Rid Of The Whole Number 1 3 W# D + N = NewN = = 7 *New improper fraction: 7 4 * Place New (N) numerator over the old (D) denominator to make your new fraction. Steps 2, 3 & 4 Find The Lowest Common Denominator What number do both 4 and 3 go into evenly? Answer: 12 What number do we have to multiply 3 by to get 12? Answer: 4 What number do we have to multiply 4 by to get 12? Answer: = + = W# =1 D=4 N=3 Add numerators together = = Reduce To 2 Lowest Terms = Page 11

12 Example of Subtraction: Step 1: Example: Subtraction = Follow the formula 1 3 W# D + N = NewN = = 7 New fraction *New improper fraction: 7 4 W# =1 D=4 N=3 * Place New (N) numerator over the old (D) denominator to make your new fraction. Steps 2, 3 & 4 Find The Lowest Common Denominator Subtract 2 nd numerator from the 1 st numerator What number do both 4 and 3 go into equally? Answer: 12 What number do we have to multiply 3 by to get 12? Answer: 4 What number do we have to multiply 4 by to get 12? Answer: = - = = = Reduce To Lowest Terms = Page 12

13 MULTIPLICATION Steps 1 & 2: N/A Steps 3 & 4: Multiplication Steps: 1. No common denominator is needed! 2. If you have a mixed fraction change to an improper fraction 3. Multiply the numerators straight across. 4. Multiply the denominators straight across. 5. Reduce to lowest terms. Example: = 12 Step 5: Reduce Fraction To Lowest Terms DIVISION Steps 1 & 2: N/A Step 3 Flip the 2 nd fraction Step 4, 5 & 6: Multiply & Reduce to lowest terms The factors of 3 are 1 & = The factors of 12 are 1, 2, 3, 4, 6, & Rule: Find the largest number that can divide evenly into both the numerator and the denominator. In this example the number 3 can be divided into both numbers. Divide each number by 3 and that will give you the answer in the lowest terms (reduced). Division Steps: 1. No common denominator is needed! 2. If you have a mixed fraction change to an improper fraction. 3. Flip the second fraction so that it is reversed. 4. Multiply the numerators straight across. 5. Multiply the denominators straight across. 6. Reduce to lowest terms. Example: = = = Page 13

14 CALCULATOR INSTRUCTIONS WITH FRACTIONS: *Calculator must have an a b/c function key for this process. Example 1: Problem: 5/6 2/3 = 1 ¼ Calculator process: 5 a b/c 6 2 a b/c 3 = 1 ¼ Example 2: Problem: 3 ¾ 1 ½ = 2 ½ Calculator process: 3 a b/c 3 a b/c 4 1 a b/c 1 a b/c 2 = 2 ½ Page 14

15 FRACTIONS PRACTICE SHEET Complete each math problem and then correct each question as you go along. Give answers in lowest possible terms. Tip#1: By correcting each problem as you complete it, you will reinforce good math habits and immediately discover problem areas rather than repeating any habitual error with other math problems. 1. 6/7 + 1/4 = /4 + 2/3 = 3. 1/2 + 3/4 = / /8 = 5. 7/11-1/3 = /5-1 3/4 = /5-7/8 = 8. 5/6-1/3 = 9. 5/8 x 2 1/2 = 10. 1/2 x 5/6 = /3 x 5/8 = /5 x 5 1/3 = 13. 6/7 1/3 = /3 3/4 = /8 1 1/2 = 16. 5/6 2/3 = Page 15

16 MATH: MAKING SENSE OF PERCENTS Rule: When you see the word Of it means to multiply Rule: Always change the percentile into a decimal prior to working the formula by moving the decimal TWO PLACES to the left. (Example: 150% = 1.50; 8% = 0.08; or 98% = 0.98 see hint below). As soon as the decimal is moved you should drop the % sign from the problem. Hint: Percentages are like pennies. If you write fifty cents in your checkbook where does the decimal point go? Answer: \$ 0.50 If you change 50% into a decimal you would write it like fifty cents. 50% = 0.50 or % = 1.00 (like one dollar) or 1 5% = 0.05 (like a nickel) Hint: Most people already know percentages, they just don t realize it. If you have a leather jacket costing \$ and it is 50% off, how much will the jacket cost? Answer: \$ That same problem would be written like: 50% of 300 = 150 or 0.50 x 300 = 150 Example Problem #1: Find 25% of 200 = Example Problem: Find 25% Of 200 =? Work the Problem: 25% = 0.25 X 200 = 50 Long hand example: 200 x or 50 Example Problem #2: Find 8% of 40 = Example Problem Find 8% Of 40 =? Work the Problem 8% = 0.08 X 40 = 3.2 Example Problem #3: Find 65 ½ % of 20 = Example Problem Find 65 ½ or 65.5% Of 20 =? Work the Problem 65.5% = X 20 = 13.1 Page 16

17 PERCENT PRACTICE Rules: 1. Change the % number to a decimal by placing a decimal two spaces to the left. If there is no decimal place it two numbers from the right. 2. Multiply the numbers together. Example: 35% of 60 = re-write as = % of 150 = % of 200 = 3. 80% of 50 = 4. 20% of 335 = 5. 65% of 100 = 6. 60% of 50 = 7. 25% of 96 = 8. 20% of 125 = 9. 50% of 6 0 = /3% of 105 = % of 410 = % of 96 = % of 99 = /3 % of 150 = % of 52 = Page 17

18 MATH ANSWERS Page 2 - Addition Page 3- Subtracting Page 4- Multiplying ,448 1, , , Page 7 - Decimals Page 15 - Fractions / / ¼ / / / /40 8. ½ / / / / / / / ¼ Page 17 - Percentages

19 MORE MATH PRACTICE 1. Addition a = b = c = d = e = 2. Subtraction a = b = c = d = e = 3. Multiplication a. 5 x 0.4 = b. 7 x = c. 5 x 3.5 = d. 10 x 0.07 = e. 100 x = 6. Percentages a. 25% of 4.8 = b. 30% of 17 = c. 15% of 36 = d. 75% of 74 = e. 63% of 97 = 7. Ratio / Proportion Find x in the following: a. 5:200 :: x :40 b. ½ : 2 :: ¼ : x c. x : 30 :: 4 : 10 d : x :: 0.15 : 30 e. 20 : 60 :: x : Division a. 0.2 / 100 = b / 25 = c. 2.5 / 3 = d / 15 = e / 10 = 5. Fractions a. 2/5 + 1/8 = b. 2 ½ - 1 ¾ = c. 2/3 x ¼ x 3/5 = d. 1/8 / 3/5 = e. Change ¾ to a decimal = 19

20 MORE MATH PRACTICE ANSWERS 1. Addition a =.5537 b = c =.4383 d = e = Subtraction a =.17 b = c = 0.7 d = e = Ratio / Proportion Find x in the following: a. 5:200 :: x :40 x = 1 b. ½ : 2 :: ¼ : x x = 1 c. x : 30 :: 4 : 10 x = 12 d : x :: 0.15 : 30 x = 10 e. 20 : 60 :: x : 50 x = Multiplication a. 5 * 0.4 = 2.0 b. 7 * = c. 5 * 3.5 = 17.5 d. 10 * 0.07 = 0.70 e. 100 * = Division a. 0.2 / 100 = b / 25 = c. 2.5 / 3 = d / 15 = e / 10 = Fractions a. 2/5 + 1/8 = 21/40 b. 2 ½ - 1 ¾ = 3/4 c. 2/3 * ¼ * 3/5 = 1/10 d. 1/8 / 3/5 = 5/24 e. Change ¾ to a decimal = Percentages a. 25% of 4.8 = b. 30% of 17 = 5.10 c. 15% of 36 = 5.40 d. 75% of 74 = e. 63% of 97 =

21 Formula One FORMULA FOR DOSE CALCULATIONS FORMULA Form of Medication Pills Liquid Medication Formula Long hand Calculator D H = X X H D D H = X D H Q = X X 1 Q = X H D D H Q = X Legend for the Formula = (Multiply the numbers together) D = MD order H = Dose on hand/supply X = The amount of medication to give X 1 = A temporary answer Q = Amount of liquid that a set amount of medication is diluted by. It does not mean how much liquid is in the bottle. Example of Q: On Hand (H) = MedZ 10mg/5ml H Q H=10mg Q=5ml 21 Dosage Calculations: Page 1 of 4

22 Step 1 Step 2 Step 3 Pill: Medication Formula Steps Is the MD order (D) unit and the on hand (H) unit the same? Yes = Go onto step 2 No = Convert the MD order to the unit on hand. (See metric conversion chart) D H = X Divide the amount ordered by the amount on hand Always double-check your answer & Make sure it is labeled correctly! Pill Formula example: MD order: MedZ 2 g PO now. On Hand: MedZ 500 mg tablets. Step 1: Convert the MD order with the formula on the metric conversion chart. Conversion factor: Look at the conversion chart where mg & grams are located: 1000 mg = 1 gram (except for ml to cc because they are equal values, the conversion factor is NEVER a one ) Rule: To convert larger unit to smaller unit, multiply by the conversion factor Rule: To convert smaller unit to a larger unit, divide by the conversion factor Rule: Only convert the unit of the MD order, never convert the unit you have on hand. The unit must be the same for both the supply and MD order prior to working the formula. Once you have divided the unit is cancelled out. Step 2: Follow the formula Grams (larger) Milligrams (smaller) = multiply by 1000 D= 2 g = mg D= 2 g 1000 = 2000 mg D= 2000 mg D H = X D=2000 mg H=500 mg Formula Long hand Calculator D H = X X H D D H = X 2000 mg 500 mg = 4 tabs 4 tabs 500 mg 2000 mg 2000 mg 500 mg = 4 tabs Step 3: Double-check your answer & Make sure it is labeled correctly! 22 Dosage Calculations: Page 2 of 4

23 Liquids: Medication Formula Steps Step 1 Step 2 Step 3 Is the MD order (D) unit and the on hand (H) unit the same? Yes = Go onto step 2 No = Convert the MD order to the unit on hand. (See metric conversion chart) D H Q = X Divide the amount ordered by the amount on hand Always double-check your answer & Make sure it is labeled correctly! Liquid formula example: MD order: MedZ concentrate 750 mg IM now. On Hand: MedZ concentrate 1 g/2 cc s. Step 1: Convert the MD order with the formula on the metric conversion chart. Conversion factor: 1000 milligrams (mg) = 1 gram (g), so the conversion factor = 1000 Rule: To convert larger unit to smaller unit multiply by the conversion factor Rule: To convert smaller unit to a larger unit divide by the conversion factor Rule: Only convert the unit of the MD order, never convert the unit you have on hand. The unit must be the same for both the supply and MD order prior to working the formula. Once you have divided the unit is cancelled out. Step 2: Follow the formula Milligrams (smaller) Grams (larger) = divide by 1000 D= 750 mg = g D= = 0.75 g D= 0.75 g D H Q = X D=0.75 g H=1 g Q= 2 cc s Formula Long hand Calculator D H Q = X X 1 Q = X H D D H Q = X 0.75 g 1g 2 = 1.5 cc s 1g = 1.5 cc s 0.75 g 0.75 g 1g 2 cc s = 1.5 cc s Step 3: Double-check your answer & Make sure it is labeled correctly! 23 Dosage Calculations: Page 3 of 4

24 METRIC CONVERSION CHART What is the conversion factor for grams to milligrams? 1g = 1000 mg, conversion factor is 10 Conversion factors are in bold. With exception of cc to ml (because they are equal), the conversion factor is LIQUID MEASUREMENT WEIGHT OTHER METRIC APOTHECARY METRIC APOTHECARY METRIC * 1000 ml 1 quart 30 g 1 oz *5 cc 1 TSP *500ml 1 pint 1 g 15 grains *15 cc s 1 TBSP *30 ml 1 fluid oz *60 mg 1 grain 240 cc s 1 CUP 1 ml 15 OR 16 minims 1 mg 1/60 grains * 1 kg 2.2 pou 0.06 ml 1 minim METRIC CONVERSIONS UNITS OF VOLUME (LITER) UNITS OF SOLIDS * 1 cc 1 ml * 1 g 1000 mg * 1 liter 1000 ml * 1 mg 1000 mcg 1 L 100 centiliters 1 g 100 centigrams 1 L 10 deciliters 1 g 10 decigrams 1 dekaliter 10 L 1 dekagram 10 g 1 hectoliter 100 L 1 hectogram 100 g 1 kiloliter 1000 L 1 kilogram 1000 g To convert from a smaller unit to a larger unit Divide by the conversion factor listed above To convert from a larger unit to a smaller unit Multiply by the conversion factor listed above How do you know what unit is smaller or larger than another? Here is a table that compares the size of metric units against DECIMAL FINDER \$1000 \$100 \$10 \$ THOUSANDS HUNDREDS TENS ONES TENTHS HUNDREDTHS THOUSANDTHS MIL KILO HECTO DEKA SINGLE UNIT DECI CENTI MILLI M k h dk g, L, or m d c m 24 Dosag

25 Formula Two: Ratio DOSAGE CALCULATIONS: RATIO FORMULA Example: MD Order: MedQ2gponow On Hand: MedQ 500 mg tablets From Conversion Chart MD order to On Hand Unit (unknown number of mg) 1gis to 1000 mg as 2g is to Xmg STEP ONE: CONVERSION MD unit ordered & On Hand unit as listed on the conversion chart 1g = 1000 mg MD amount ordered, labeled with unit & X = amount of unit needed 2 g = X mg Unit Ordered : Unit On Hand 1g : 1000 mg is to as is to (1 is to 1000 as.2 is to X) 1 : 1000 :: 2 : X :: Amount Ordered : Amount of Unit Needed. :: 2g : Xmg STEP TWO: CALCULATION 1 X= X = 2000 mg Now you have converted the MD order (2 grams) into the unit on hand (2000 mg), next find the amount of medication to give Use the ratio of: Converted On Hand Dose : per Amount :: MD order : X Amount to give. 500 mg : 1 tab :: 2000 mg : X tabs 500 X = X = X = 4 tablets 25

26 INSTRUCTIONS TO CALCULATE MEDICATIONS BY WEIGHT In some cases medications will be ordered based on the weight of the patient. Usually this requires the MA to figure out what the patients weight is in kilograms (kg). You may wish to practice this by taking your own weight in pounds, place it into your calculator and divide it by the conversion factor of 2.2. The answer will be your weight in kg (might be nice to list this on your drivers license). If the order reads: MedX 5mg/kg PO now You would read it MedX 5 milligrams per (or for each) kilogram by mouth now STEPS: 1. Determine the patients weight in kilograms (Lbs divided by conversion factor 2.2) 2. Multiply the ordered medication by the number of kg. 3. Final answer is then what the physician really ordered. Example: Mr. James weighs 264 Lbs. The physician has ordered for MexX 5mg/kg as listed above Lbs 2.2 = 120 kg 2. 5 mg 120 kg = 600 mg 3. The physician really ordered 600 mg to be given by mouth now to Mr. James. 26

27 Practice Problems for Conversions Complete the following by using your Metric Conversion Chart, Step one of the Dosage Calculation Formula, or using the Ratio method of converting. ALWAYS LABEL YOUR ANSWER! Correct each problem prior to moving onto your next problem Lbs = KG Lbs = KG Lbs = KG g = mg mg = g mg = g g = mg 8. 5 tsp = ml 9. 2 Tbsp = tsp ml s = cc s 27

28 Dosage Calculation Practice Worksheet Correct each problem right after you complete it. Tip#1: By correcting each problem as you complete it, you will reinforce good math habits and immediately discover problem areas rather than repeating any habitual error with other problems. 1. MD Order: MedX 1.5g PO. On Hand: MedX 750mg tabs. How many tablets will you give? 2. MD Order: MedX 1.5g IM. On Hand: MedX 500mg/cc. How many mg do you give? How many cc s do you draw up? 3. MD Order: MedK 25mg PO. On Hand: MedK 10mg tabs. How many tablets do you give? 4. MD Order: MedA 3g PO. On Hand: MedA 750mg tabs. How many tablets do you give? 5. MD Order: MedK elixer 125mg PO. On Hand: MedK elixer 25mg/5cc. How many cc s do you give? 6. MD Order: MedA elixer 1g PO. On Hand: MedA elixer 200mg/3cc. How many cc s do you give? 7. MD Order: MedX 60mg IM. On Hand: MedX 100mg/cc. How many cc s do you inject? 8. MD Order: ZMed 650mg. On Hand: ZMed 325mg. How many tablets do you give? 9. MD Order: KrZMED 2g PO. On Hand: KrZMED 500mg tablets. How many tablets do you give? 10. MD Order: MedQ 1500mg PO. On Hand: MedQ 1g tablets. How many tablets do you give? 11. Mr. Smith weighs 180 pounds. MD Order: MedX 5mg/kg PO. How many kg s does Mr. Smith weigh? How many mg of MedX is Mr. Smith going to receive? (you may round off to the nearest kg) 12. Mr. Jones weighs 240 pounds. MD Order: MedX 2mg/kg. How many kg s does Mr. Jones weigh? How many mg of MedX is Mr. Jones going to receive? 28

29 Page 26- Answers Practice Problems For Conversions KG KG KG mg g g mg ml 9. 6 tsp cc s Page 27- Dosage Calculations Practice Worksheet Answers: 1. 2 tablets mg; 3 cc s 3. 2 ½ tablets 4. 4 tablets cc s cc s or 0/60 cc s 8. 2 tablets 9. 4 tablets ½ tablets kg; 410 mg kg; 218 mg 29

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