Subtraction Using Estimation
Estimate Difference with Rounding: Learn
A quick way to estimate the difference between two numbers is to round each number and then subtract the rounded numbers. This probably won't be the exact answer but it may be close enough for some purposes.
How to Estimate a difference by rounding:
- Round each term that will be subtracted
- Subtract the rounded numbers
Example: 132 - 85
- Round each term: 130 - 90
- Subtract the rounded numbers: 40
Estimating with Rounding: Practice
Estimate the difference by rounding the two numbers.
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Math Lessons by Grade
- Estimation and Mental Math
- Naming Numbers
- Percents and Ratios
- Place Value