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Estimate the difference between two decimals

How to Estimate a difference by rounding.

  • Round each decimal term that will be subtracted.
  • Subtract the rounded terms

Example: Estimate the difference of 0.988 - 0.53

  • Round 0.988 - 0.53 to 1 - 0.5
  • Subtract the rounded numbers to obtain the estimated difference of 0.5
  • The actual difference of 0.988 - 0.53 is 0.458

Some uses of rounding are:

  • Checking to see if you have enough money to buy what you want.
  • Getting a rough idea of the correct answer to a problem





Practice

Estimate the Difference between the decimals.

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You have correct and   incorrect.  This is percent correct.

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