Estimating Fraction and Decimal Sums and Differences
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Estimating Fraction and Decimal Sums and Differences
Estimating sums and differences for Grade 5: fractions with like and unlike denominators rounded to 0, 1/2, or 1, and mixed numbers and decimals rounded to whole numbers, then four answers to judge by an estimate. With an answer key.
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Teach it first
Benchmark FractionsA teaching handout to hand out before this sheet: the rule, worked examples and common mistakes.- Pages
- 1
- Last updated
- Time
- About 20 minutes
- Answer key
- Included
- Goes with
- Estimating with Benchmark Fractions
- Printing
- Black and white
- Related curriculum
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Add and subtract fractions that have the same bottom number by adding or subtracting the top numbers, then write the answer in simplest form.
Reviewed by Mrs. Catherine Reynolds, Teacher. How we check worksheets
How to use this sheet
- Have the child say each problem in words with the unit: "2 eighths plus 3 eighths is 5 eighths."
- Check that the denominators match before starting each problem.
- For word problems, draw a bar cut into the right number of parts and shade the amounts.
Common mistakes
- Adding the bottom numbers too, so 2/8 + 3/8 becomes 5/16. The parts are still eighths.
- Forgetting to simplify, or to write an answer more than 1 as a mixed number when asked.
- Subtracting the smaller top number from the larger whatever the order. Read the problem again.
