Estimate First: Decimals, Percents, and Fractions
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Estimate First: Decimals, Percents, and Fractions
Estimation worksheet for Grades 7 and 8: twelve calculations such as 4.8 × 19.6, 19% of 412 and 3/8 of 161. Round to easy numbers and circle the best of three estimates. With an answer key.
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- Pages
- 1
- Last updated
- Time
- About 15 minutes
- Answer key
- Included
- Printing
- Black and white
- Related curriculum
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Round the numbers or use compatible numbers to estimate a sum, difference, product or quotient, and use the estimate to check whether an exact answer is reasonable.
Reviewed by Mr. Daniel Carter, Teacher and Mr. Robert Harrison, Teacher. How we check worksheets
How to use this sheet
- Have the child round every number first and write the rounded problem above the real one.
- Ask whether the estimate should be more or less than the exact answer, and why, before working it out.
- Use the estimate to check an exact answer. If they are far apart, look for a slip in the exact work.
Common mistakes
- Working the exact answer first and then rounding it. That skips the point of estimating.
- Rounding to the wrong place, such as to the nearest ten when the question asks for hundreds. Underline the place first.
- Thinking an estimate is wrong because it is not exact. A good estimate is close, and quick to find.
