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Decimals Review

Decimals Review. by Lauren McCluskey. Decimal Models. Tenth. Hundredth. by Christine Berg. Remember that each period has three place values within the period. Ten -thousandths Hundred-thousandths. Tenths Hundredths Thousandths. Hundreds Tens Million Ones. Hundreds

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Decimals Review

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  1. Decimals Review by Lauren McCluskey

  2. Decimal Models Tenth Hundredth by Christine Berg

  3. Remember that each period hasthree place values within the period Ten -thousandths Hundred-thousandths Tenths Hundredths Thousandths Hundreds Tens Million Ones Hundreds Tens Thousand Ones Hundreds Tens Ones Ones 671,690,492.36754 by Moncia Yuskaitis

  4. Equivalent Decimals 0.6 or 6 tenths 0.60 or 60 hundredths by Christine Berg

  5. Use rounding • When the question asks you • to estimate. • When you want to know if your answer is reasonable. by Monica Yuskaitis

  6. Memorize this Poem Find your number. Look right next door. 4 or less just ignore. 5 or more, add 1 more. by Monica Yuskaitis

  7. Round to the tenths: • 75.86 • 75.83 • 75.96 • 75.835

  8. Find your number.Look right next door.4 or less just ignore.5 or more, add 1 more. • 75.86 is about 75.9 • 75.83 is about 75.8 • 75.96 is about 76.0 • 75.835 is about 75.8

  9. Which is greater: 0.6 or 0.58? 0.6 0.58 by Christine Berg

  10. Which is greater: 0.400 or 0.5? 0.400 0.5 by Christine Berg

  11. Adding or Subtracting Decimals • When adding or subtracting decimals, line them up! What is: • $7.54 + $3.56? • $15.00 - $6.27? • $0.75 + $1.25 + $6.79? • 75.425 + 3.5005? • 98.322 – 7.0545?

  12. Adding or Subtracting Decimals • When adding or subtracting decimals, line them up! What is: • $7.54 + $3.56 = $11.10 • $15.00 - $6.27 = $8.73 • $0.75 + $1.25 + $6.79 = $8.79 • 75.425 + 3.5005 =78.9255 • 98.322 – 7.0545 = 91.2675

  13. Multiplying Decimals • Multiplying decimals is counter-intuitive. • What is 0.10 * 6? • Think about money. 0.10 is a dime, and you have 6 of them, so how much do you have? 0.60.

  14. Multiplying Decimals 0.6 = 0.1 *

  15. Multiplying Decimals 0.06 0.6 = 0.1 * Or… one tenth of 6 tenths is 6 hundredths.

  16. Try it! • 2.50 * 0.1 ? • 87.655 * 0.001? • 125.75 * 1.0?

  17. Try it! • 2.50 * 0.1 = 0.250 • 87.655 * 0.001 = 0.087655 • 125.75 * 1.0 = 12.575

  18. Dividing Decimals Dividing decimals can be counter-intuitive. Dividing a decimal by a decimal can give you a larger number. 6 tenths 0.6 ÷ 0.1= Or… there are 6 tenths in 0.6.

  19. Try it! • 875.25 ÷ 0.01 ? • 9218.4 ÷ 0.1? • 722.36 ÷ 0.0001?

  20. Try it! • 875.25 ÷ 0.01 = 87,525 • 9218.4 ÷ 0.1 = 92,184 • 722.36 ÷ 0.0001 = 7,223,600

  21. Credits: • Comparing and Rounding Decimals byChristine Berg • Math Flash Place Value by Monica Yuskaitis • Math Flash Rounding by Monica Yuskaitis

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