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1 Math Mammoth End-of-the-Year Test, Grade 6, Answer Key Instructions to the teacher: In order to continue with the Math Mammoth Grade 7 Complete Worktext, I recommend that the student score a minimum of 80% on this test, and that the teacher or parent review with the student any content areas in which the student may be weak. Students scoring between 70% and 80% may also continue with grade 7, depending on the types of errors (careless errors or not remembering something, versus a lack of understanding). Use your judgment. My suggestion for points per item is as follows. The total is 194 points. A score of 155 points is 80%. Question # Max. points Student score Basic Operations 1 2 points 2 3 points 3 2 points 4 2 points subtotal / 9 Expressions and Equations 5 4 points 6 2 points 7 2 points 8 1 point 9 2 points 10 2 points 11 2 points 12 2 points 13 2 points 14 2 points 15 1 point 16 2 points 17 2 points 18 2 points 19 4 points subtotal / 32 Decimals 20 2 points 21 2 points 22 1 point 23 2 points 24 2 points 25 1 point 26 2 points Question # Max. points Student score Decimals, cont points 28a 1 point 28b 2 points 29 3 points subtotal / 20 Measuring Units 30 3 points 31 1 point 32 2 points 33 3 points 34 6 points 35 4 points subtotal / 19 Ratio 36 2 points 37 2 points 38 2 points 39 2 points 40 2 points 41 2 points 42 2 points subtotal / 14 Percent 43 3 points 44 4 points 45 2 points 46 2 points 47 2 points subtotal /13 1

2 Question # Max. points Student score Prime Factorization, GCF, and LCM 48 3 points 49 2 points 50 2 points 51 2 points 52 2 points subtotal /11 Fractions 53 3 points 54 2 points 55 2 points 56 2 points 57 3 points 58 3 points subtotal /15 Integers 59 2 points 60 2 points 61 2 points 62 4 points 63 5 points 64 6 points 65 4 points subtotal /25 Question # Max. points Student score Geometry 66 1 point 67 1 point 68 3 points 69 4 points 70 2 points 71a 1 point 71b 3 points 72 4 points 73a 2 points 73b 2 points subtotal /23 Statistics 74a 2 points 74b 1 point 74c 2 points 75a 1 point 75b 1 point 76a 2 points 76b 1 point 76c 1 point 76d 2 points subtotal /13 TOTAL /194 2

3 The Basic Operations 1. a. 2, = 52 R4. There will be 52 bags of cinnamon. 2. a. 2 5 = 32 b. 5 3 = 125 c = 10,000, a. 70,200,009 b. 304,500, a. 6,300,000 b. 6,609,900 Expressions and Equations 5. a. s 2 b. (7 + x) 2 c. 5(y 2) d. 4 x 2 6. a = 24 b. 65 = 13 3 = a. \$50 2m or \$50 m 2 b. s 2 8. z + z x + x + x = 2z + 3x + 8 or 3x + 2z + 8 or 2z x 9. 6(s + 6) or (s s s s s s + 6. It simplifies to 6s b 3b = 18b a. 3x b. 14w a. 7(x + 5) = 7x + 35 b. 2(6p + 5) = 12p a. 2(6x + 5) = 12x + 10 b. 5(2h + 6) = 10h a. x 31 = 6 x = 6 31 x = 186 b. a 8.1 = 2.8 a = a = y = x = OR 25x = The solution is x = 67 quarters. 17. a. p 5. The variable students use for "pieces of bread" may vary. b. a 21. The variable students use for "age" may vary. 18. a. x > 31 b. x 9 3

4 19. a. t (hours) d (km) b. See the grid on the right. c. d = 80t d. t is the independent variable Decimals 20. a b a ,000 b ,000, a. 8 b a. Estimate: = b. Exact: = = a. 90,500 b a = b. 2 9 = a. Estimate: = (3 1/4) 3 = \$9.75 b. Exact: \$ (3 \$ \$4.56) 2 = \$8.06 4

5 Measuring Units 30. a. 178 fl. oz. = 5.56 qt b mi. = 2, ft c lb = oz mile 32. You can get 10 six ounce serving and have 4 ounces left over. 33. It is about \$6.65 per pound. To calculate the price per pound, simply divide the cost by the weight in pounds. A pack of 36 candy bars weighs oz = 55.8 oz = lb. Now simply divide the cost of those candy bars by their weight in pounds to get the price per pound: \$ lb = \$ / lb. 34. a. 39 dl = 3.9 L 3 9 kl hl dal l dl cl ml c. 7.5 hm = 75,000 cm km hm dam m dm cm mm e. 7.5 hg = 0.75 kg kg hg dag g dg cg mg b. 15,400 mm = 15.4 m km hm dam m dm cm mm d. 597 hl = 59,700 L kl hl dal l dl cl ml f. 32 g = 3,200 cg kg hg dag g dg cg mg 35. a. Twenty-four bricks will cover the span of the wall mm 215 mm = b. Twenty-three bricks will cover the span of the wall mm 225 mm = Ratio 36. a. b. 10:15 = 2:3 37. a. 3,000 g:800 g = 15:4 b. 240 cm:100 cm = 12:5 38. a. \$7:2 kg b. 1 teacher per 18 students 39. a. \$4 per t-shirt. b. 90 miles in an hour 40. a. You could mow 20 lawns in 35 hours. b. The unit rate is 105 minutes per lawn (or 1 h 45 min per lawn). Lawns Hours Mick got \$ \$ = \$ a km b qt 5

6 Percent 43. a. 35% = = 0.35 b. 9% = = 0.09 c. 105% = = % of the number 5.1 5% of the number % of the number 51 30% of the number The discounted price is \$39. You can multiply 0.6 \$65 = \$39, or you can find out 10% of the price, which is \$6.50, multiply that by 4 to get the discount (\$26), and subtract the discounted amount. 46. The store had 450 notebooks at first. Since 90 is 1/5 of the notebooks, the total is 90 5 = She has read 85% of the books she borrowed from the library. 17/20 = 85/100 = 85%. Prime Factorization, GCF, and LCM 48. a b c. 97 is a prime number 49. a. 8 b a. 2 b Any three of the following numbers will work: 112, 140, 168, a. GCF of 18 and 21 is = = 3(6 + 7) b. GCF of 56 and 35 is = 7(8 + 5) Fractions 53. a. 4 b. 2 1/12 c. 5 3/ = Answers will vary. Please check the student's work. Example: There was 1 3/4 pizza left over and three people shared it equally. Each person got 7/12 of a pizza. 56. There are ten servings. (7 1/2) (3/4) = (15/2) (3/4) = (15/2) (4/3) = 60/6 = /9 square feet. The area of the room is (12 1/2) (15 1/3) = (25/2) (46/3) = 25 23/3 = 575/3 = 191 2/3 square feet. One-third of that is (191 2/3) (1/3) = 574/9 = 63 8/9. Or, you can first divide one of the dimensions by three, and then multiply to find the area /20 inches and 3 1/10 inches or 4.65 inches and 3.1 inches. The ratio of 3:2 means the two sides are as if three "parts" and two "parts", and the total perimeter is 10 of those parts. Therefore, one part is 15 1/2 in. 10 = 15.5 in. 10 = 1.55 inches. The one side is three times that, and the other is two times that. So, the sides are 4.65 in. and 3.1 in. If you use fractions, you get (15 1/2 in. ) 10 = (31/2 in. ) 10 = 31/20 in., and the two sides are then 3 31/20 in. = 93/20 in. = 4 13/20 in. and 2 31/20 in. = 62/20 in. = 3 1/10 in. 6

7 Integers 59. a. > b. > 60. a. 7 C > 12 C. b. \$5 > \$ a. The difference is 23 degrees. b. The difference is 12 degrees. 62. a. 7 b. 6 = 6 c. 5 = 5 d. 6 = a.- c See the grid on the right. d = 30 The area of the resulting triangle is 30 square units. 64. a = 3 b. 2 4 = 6 c. 1 5 = a. That would make his money situation to be \$4. \$10 \$14 = \$4 OR \$10 + ( \$14) = \$4 b. Now he is at the depth of 3 m. 2 m 1 m = 3 m OR 2 m + ( 1 m) = 3 m 7

8 Geometry 66. The area is = 6 square units. 67. Answers may vary. The base and altitude of the parallelogram could be for example 5 and 3, or 3 and 5, or 6 and 2 1/ Divide the shape into triangles and rectangles, for example like this: The areas of the parts are: triangle 1: 3 square units rectangle 2: 12 square units triangle 3: 4.5 square units triangle 4: 18 square units The overall shape (pentagon): 37.5 square units 69. It is a trapezoid. To calculate its area, divide it into triangles and rectangle(s). The area is: = 45.5 square units 8

9 70. It is a triangular prism. Some possible nets are shown below: 71. a. It is a rectangular pyramid. b. The rectangle has the area of 300 cm 2. The top and bottom triangles: 2 20 cm 11.2 cm 2 = 224 cm 2. The left and right triangles: 2 15 cm 13 cm 2 = 195 cm 2. The total surface area is 719 cm The volume of each little cube is (1/2 cm) (1/2 cm) (1/2 cm) = 1/8 cm 3. a. 18 (1/8) cm 3 = 18/8 cm 3 = 9/4 cm 3 = 2 1/4 cm 3. b. 36 (1/8) cm 3 = 36/8 cm 3 = 9/2 cm 3 = 4 1/2 cm a. 1 3/4 in 8 1/2 in 6 in = (7/4) in (17/2) in 6 in = (119/4) 6 in 3 = (29 3/4) 3 in 3 = 87 9/4 in 3 = 89 1/4 in 3. This calculation can also be done (probably quicker) by using decimals: 1.75 in 8.5 in 6 in = in 3. b. Imagine you place the boxes in rows, standing up, so that the height is 6 inches. Then we can stack two rows on top of each other, since the height of the box is 1 ft or 12 inches. The width of each box is 1 3/4 in., and 6 boxes fit in the space of 1 ft., because 6 (1 3/4 in.) = 6 18/4 in. = 10 1/2 in. Since the last dimension is over 8 inches, we cannot fit but one row. So, we can fit two rows of 6 boxes, stacked on top of each other, or a total of 12 boxes. Statistics 74. a. See the plot on the right. b. The median is 68.5 years. c. The first quartile is 63, and the third quartile is The interquartile range is thus 12.5 years. Stem Leaf a. It is right-tailed or right-skewed. You can also describe it as asymmetrical. b. Median. Mean is definitely not the best, because the distribution is so skewed. Without seeing the data itself, we cannot know if mode would work or not - it may not even exist, since typically for histograms, the data is very varied numerically and has to first be grouped. 76. a. b. It is fairly bell-shaped but is somewhat left-tailed or left-skewed. You can also say it is asymmetrical. c. The data is spread out a lot. d. Any of the three measures of center works. Mean: 6.4. Median: 7. Mode: 7. 9

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