MULTIPLY BY POWERS OF 10 PROBLEMS To see the answer, pass your mouse over the colored area. 11. True or false? 11. a) 628 × 10 = 6,280 True. b) 6.28 × 10 = 6.280 False. 11. c) 6.28 × 10 = 62.8 True. 12. Complete the following with either "left" or "right". 12.
a) To multiply a decimal by 10, move the decimal point one place 6.75 × 10 = 67.5 12.
b) To divide a decimal by 10, move the decimal point one place 6.75 ÷ 10 = .675 13. Multiply each number by 10. Then multiply by 100; by 1000.
14. Calculate by moving the decimal point or by adding on 0's.
15. If one item cost $2.45, then 15. a) 10 will cost $24.50. 15. b) 100 will cost $245. 15. c) 1000 will cost $2,450. 16. a)
If 2 pounds of cheese cost $11.50, then how much will 20 pounds 16. b) If 4 pounds of coffee cost $21.95, how much will 40 pounds 17. a) $12.50 = 10 × $1.25 17. b) $125 = 100 × $1.25 17. c) $1,250 = 1000 × $1.25 18. Divide each number by 10. Then divide by 100; by 1000.
19. Calculate by moving the decimal point.
10. How many decimal places has each number? 10. a) 423.6 One. b) 4.236 Three. c) 4,236 None. 10. d) .05 Two. e) 6.2000 Four. 11. Calculate each column. Separate the correct number of decimal
12. Divide by 10. Then divide by 100.
13. Complete the following with the correct operation -- multiplication 13. or division by a power of 10.
14. Scientific notation. Each of these is written in scientific notation. 14. What normal number is it?
15. Write each of the following in scientific notation.
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