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Decimals

Decimals. Multiplication and Division. What is to be learned?. How to multiply decimals by any number How to divide decimals by any number. Multiplying and Dividing. . 4.12 X 3 4.12 X 3 12 36 8.48 ÷ 4 4 8.48. 2 12. . Multiplying/Dividing Decimals.

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Decimals

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  1. Decimals Multiplication and Division

  2. What is to be learned? • How to multiply decimals by any number • How to divide decimals by any number

  3. Multiplying and Dividing . 4.12 X 3 4.12 X 3 12 36 8.48 ÷ 4 4 8.48 2 12 .

  4. Multiplying/Dividing Decimals Steps to success Don’t forget Me! Multiply/Divide as Normal Put decimal point in answer Check decimal points are in a line . 3.4 X 2 6 8

  5. The Test of Success What is to be learned? Steps to success Multiply/Divide as normal Put Decimal Point in Answer Check decimal points are in a line How to multiply/divide decimals 5.31 X 4 . 5.31 X 4 21 24

  6. What is to be learned • How to multiply decimals by 10 and 100 • How to divide decimals by 10 and 100

  7. A wee problem 10 X 13 = 10 X 1.3 = 1.30 130

  8. Multiplying by 10 0 1 0.1 0.1 X 10 = 1.0 . point moves one place to right 0 1 0 X10

  9. 3.56 X 10 35.6 15.78 X 10 157.8 2.3 X 10 23 (23.0)

  10. Multiplying by 100 Point moves two places to right 2.789 X 100 278.9 3.56 X 100 356 (356.0)

  11. Wee Problem 3.2 X 100 X 100 X 10 X 10 same as X 10 X 10 3.2 320 32

  12. You Try 45.6 1. 4.56 X 10 2. 3.4 X 10 3. 0.34 X 10 4. 2.678 X 100 5. 3.56 X 100 6. 3.4 X 100 7. 0.5 X 100 34 3.4 267.8 356 340 50

  13. Multiplying Decimals by 10,100 Steps to success X10 move point one place to right X100 multiply by 10 twice 5.83 X 10 3.7 X 100 3.7 X 10 = 37 = 58.3 X 10 = 370

  14. The Test of Success What is to be learned? Steps to success X10 move point one place to right X100 multiply by 10 twice How to multiply decimals by 10 and 100 5.6 X 10 = 56 (or 56.0) 3.7 X 100 = 370

  15. Dividing by 10 Point moves oneplaces to left 43.2 ÷ 10 4.32 348.9 ÷ 10 34.89

  16. More Difficult .0 42 ÷ 10 4.2 (or 4.20) 236 ÷ 10 23.6 1.56 .156 0

  17. Dividing by 100 ÷ 100 435.6 ÷ 100 4.356 48.9 ÷ 100 0.489 362 ÷ 100 3.62 ÷ 10 ÷ 10 same as

  18. Dividing Decimals by 10,100 Steps to success ÷ 10 move point one place to left (put .0 if necessary) ÷ 100 divide by 10 twice 62 ÷ 10 45.83 ÷ 100 45.83 ÷ 10 = 4.583 .0 = 6.2 (or 6.20) ÷ 10 = .4583 0

  19. The Test of Success What is to be learned? Steps to success ÷10 move point one place to left (put .0 if necessary) ÷100 divide by 10 twice How to divide decimals by 10 and 100 8 ÷ 10 = 0.8 2.6 ÷ 100 = 0.026

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