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