Nursing 131 Household to Metric Conversion

Transcription

1 Nursing 3 Household to Metric Conversion Slide 2 & 3 In the metric system liquid volumes are measured in milliliters or liters. Weight is measured in micrograms, milligrams, grams, or kilograms. liter 000 milliliter kilogram,000 grams,000,000 milligrams,000,000,000 micrograms In the household system liquid volumes are measured in quarts, pints, cups, tablespoons, and teaspoons. Weight is measured in ounces & pounds. quart 2 pints 4 cups 64 tablespoons 92 teaspoons 6 ounces pound Nursing 3 Household to Metric Conversion

2 Slide 4 & 5 Eample One Our First Eample Problem: 2 ½ teaspoons of cough medicine has been prescribed. A measuring device marked in ml is being used. How many ml should be administered? Here are the 5 basic steps to change from one unit to another Step - Identify that you need to convert Step 2 Write down what you have Step 3 Write down your equivalent fraction Step 4 Reduce units Step 5 Perform the math Nursing 3 Household to Metric Conversion

3 Slide 6 Solution to Eample One Metric/Household Conversion Our Eample Problem: 2 ½ teaspoons of cough medicine has been prescribed. A measuring device marked in ml is being used. How many ml should be administered? Step Identify you need to convert The question asks how many of one unit should we prepare in another type of unit. Step 2 Write down what you have The quantity we have our known quantity - is 2 ½ tsp. (teaspoons) Write this as a fraction with on the bottom. 2 ½ tsp Our Eample Problem: 2 ½ teaspoons of cough medicine has been prescribed. A measuring device marked in ml is being used. How many ml (Writing should the be amount administered? as a fraction will help us when we multiply later.) An equivalency chart will list how the units relate. Conversions between Household and Metric Units quart liter (l) pint 500 milliliters (ml) cup 240 milliliters (ml) Household/Metric fluid ounce (oz.) Conversion milliliters (ml) tablespoon (tbsp.) 5 milliliters (ml) teaspoon (tsp.) 5 milliliter (ml) 2.2 pound (lbs) kilogram (kg) 2 ½ tsp X 5 ml tsp To convert we will need to multiply our fractions. Step 4 Reduce the units Cross off any matching pairs of unit labels. The label left should be what you want to find. 2 ½ tsp 5 ml Household/Metric Conversion tsp Step 5 Perform the math 2 ½ tsp 5 ml tsp In this eample the 2 ½ only 5unit left 2.5 is ml which is what (Reduce we want any to fractions.) find. 2.5 ml 2 ½ teaspoons is equivalent to 2.5 ml. If you re having difficulty with the mied number (2 ½), you may want to watch the Operations with Mied Numbers tutorial. Nursing 3 Household to Metric Conversion

4 Slide 4 Eample Two Our Second Eample Problem: A child weighs 24 lbs, 4 oz. You determine that 24 lbs., 4 oz. is equivalent to kg. Nursing 3 Household to Metric Conversion

5 Slide 5-9 Solution to Eample Two Our Second Eample Problem: A child weighs 24 lbs, 4 oz. You determine that 24 lbs., 4 oz. is equivalent to kg. Step Identify you need to convert The key words that indicate we need to convert are equivalent to. Step 2 Write down what you have The quantity we have is in 2 different units. We have 24 lbs and we have 4 oz. We first change the 4 oz to lbs by dividing by 6. Household/Metric We then add this to the 24lbs. Conversion Use a calculator or long division to change the 4/6 to a decimal. We can then write this as a fraction with on the bottom. Our Second Eample Problem: 4 A child weighs 24 + lbs, 244 oz. = You determine that lbs., 4 oz. is equivalent 6 to kg. An equivalency chart will list how the units relate. Conversions between Household and Metric Units quart liter (l) pint 500 milliliters (ml) cup 240 milliliters (ml) fluid ounce (oz.) milliliters (ml) tablespoon (tbsp.) 5 milliliters (ml) teaspoon (tsp.) 5 milliliter (ml) 2.2 pound (lbs) kilogram (kg) An equivalency chart will list how the units relate. Our chart lists kg =. We will write this equivalency as a fraction. We can write this fraction 2 ways: kg or kg Because the fraction we wrote in step 2 has lbs on the top, our net fraction must have lbs on the bottom lbs kg To convert we will need to multiply our fractions. Nursing 3 Household to Metric Conversion

6 Slide 20-2 Solution to Eample Two (Continued) Step 4 Reduce the units Cross off any matching pairs of unit labels. The label left should be what you want to find lbs kg In this eample the only unit left is kg which is what we want to find. Step 5 Perform the math lbs kg = _24.875_ (Reduce any fractions.) kg When converting from lbs to kg round your result to the nearest tenth. 24 lbs, 4 oz. is equivalent to.3 kg. Nursing 3 Household to Metric Conversion