Extra Practice 1. Name Date. Lesson 1: Numbers in the Media. 1. Rewrite each number in standard form. a) 3.6 million


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1 Master 4.27 Extra Practice 1 Lesson 1: Numbers in the Media 1. Rewrite each number in standard form. a) 3.6 million 3 b) 6 billion 4 c) 1 million 2 1 d) 2 billion 10 e) 4.25 million f) 1.4 billion 2. Use decimals. Round each number to the nearest hundredth of a million. a) b) c) d) e) f) Lesson 2: Exploring Thousandths 1. Write each number as a decimal. 291 a) d) b) e) c) f) Write each decimal as a fraction or a mixed number. a) b) c) d) e) f) 4.3
2 Master 4.28 Extra Practice 2 Lesson 3: Comparing and Ordering Decimals 1. Use >, <, or =. a) b) c) d) Order the numbers from greatest to least. a) 0.439, 1.004, 0.37 b) 2.83, 1.9, c) 6.237, 6.019, d) 3.105, 3.6, Write a number between and Lesson 4: Rounding Decimals 1. Round to the nearest whole number. a) b) c) d) e) f) g) 3.5 h) Round to the nearest tenth. a) 8.64 b) c) d) e) f) g) h) Round to the nearest hundredth. a) b) c) d) e) f) g) h) 1.451
3 Master 4.29 Extra Practice 3 Lesson 5: Estimating Sums and Differences 1. Estimate each sum. a) b) c) d) e) f) Estimate each difference. a) b) c) d) e) f) Lesson 6: Adding and Subtracting Decimals 1. Add. a) b) c) d) Subtract. a) b) c) d) Write vertically, then add or subtract. a) b) c) d) e) f)
4 Master 4.30 Extra Practice 4 Lesson 7: Multiplying Decimals by 10, 100, 1000, Use mental math to find each product. 1. a) b) c) a) b) c) d) e) f) g) h) i) A certain seed has a mass of g. What is the total mass of 10 of these seeds? 100 seeds? 1000 seeds? seeds? Lesson 8: Dividing Decimals by 10, 100, 1000, Use mental math to find each quotient. 1. a) b) c) a) 6 10 b) c) d) e) f) One thousand new pennies have a mass of 2350 g. What is the mass of one penny? 4. One hundred new 50cent coins have a mass of 690 g. What is the mass of one 50cent coin?
5 Master 4.31 Extra Practice 5 Lesson 9: Multiplying Whole Numbers by 0.1, 0.01, Use mental math to find each product. 1. a) b) c) a) b) c) d) e) f) Use mental math. a) b) c) Lesson 10: Multiplying Decimals by a 1Digit Whole Number 1. Multiply. a) 5.04 b) c) d) $17.35 e) f) Write vertically, then multiply. a) b) c) d) $ e) f)
6 Master 4.32 Extra Practice 6 Lesson 11: Dividing Decimals by a 1Digit Whole Number 1. Estimate. Then divide. a) b) c) 9 2 d) e) f) Divide. Multiply to check your answers. a) b) c) d) e) 5 46 f) Said paid $1.71 for a package of 9 pencils. How much did each pencil cost? Lesson 12: Dividing Decimals 1. Estimate first. Then divide until the remainder is 0. a) b) 18 4 c) d) e) f) Divide. Round each quotient to the same number of decimal places as there are in the dividend. a) b) c) $ d) 27 4 e) f) Each mini van holds 9 people. How many mini vans are needed for 76 people?
7 Master 4.33a Sample Answers Extra Practice 1 Master 4.27 Lesson 1 1. a) b) c) d) e) f) a) million b) 1.91 million c) million d) 4.58 million e) million f) 5.39 million Lesson 2 1. a) b) c) d) e) f) a) 1000 b) c) d) e) f) 4 10 Extra Practice 2 Master 4.28 Lesson 3 1. a) < 2.58 b) > c) 1.42 > d) 2.6 = a) 1.004, 0.439, 0.37 b) 2.83, 1.9, c) 6.284, 6.237, d) 5.12, 3.6, Lesson 4 1. a) 4 b) 1 c) 7 d) 3 e) 2 f) 17 g) 4 h) 6 2. a) 8.6 b) 7.2 c) 0.1 d) 7.3 e) 17.7 f) g) 1.4 h) a) 3.46 b) 7.32 c) 6.99 d) e) f) 2.59 g) 0.33 h) 1.45 Extra Practice 3 Master 4.29 Lesson 5 1. a) About 15 b) About 10.5 c) About 10 d) About 8 e) About 2 f) About 6 2. a) About 5 b) About 3 c) About 6 d) About 1 e) About 5 f) About 3 Lesson 6 1. a) b) c) d) a) b) c) d) a) b) c) d) e) f) Extra Practice 4 Master 4.30 Lesson 7 1. a) 49, 490, 4900 b) , , c) 9.37, 93.7, a) 56.3 b) c) 68.2 d) e) f) g) h) 2634 i) g, 76.3 g, 763 g, 7630 g Lesson 8 1. a) 0.45, 0.045, b) 0.762, , c) , , a) 0.6 b) c) d) e) f) g g
8 Master 4.33b Sample Answers continued Extra Practice 5 Master 4.31 Lesson 9 1. a) 2.5, 0.25, b) 0.4, 0.04, c) 14.5, 1.45, a) 0.03 b) 0.7 c) d) 5.8 e) f) a) 0.5, 0.5 b) 0.16, 0.16 c) 0.127, Lesson a) b) c) d) $ e) f) a) b) c) d) $15.12 e) f) Extra Practice 6 Master 4.32 Lesson a) A little less than 1; b) About 1.5; c) A little more than 4; 4.5 d) About 0.3; e) About 0.001; f) A little more than 1; a) 0.106; = b) 0.411; = c) 2.47; = 7.41 d) 0.204; = e) 9.2; = 46 f) 4.717; = $ = $0.19; Each pencil cost 19 cents. Lesson a) Less than 2; b) More than 4; 4.5 c) About 0.5; d) Almost 3; e) About 25; f) Less than 3; a) b) 0.6 c) $1.03 d) 7 e) f) = 8.4; 9 vans are needed.
Extra Practice 1. Name Date. Lesson 1: Numbers in the Media. 1. Rewrite each number in standard form. a) 3.6 million b) 6 billion c)
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