Use estimation to check answers for reasonableness, and calculators to check for accuracy 0306.1.6

Links verified on 08/26/2026

1. Check reasonableness of calculations - For advanced students. Checking if an answer is reasonable means we check to see whether an answer is a good approximation or estimate to the question.
2. Estimate - Definition, Examples, Quiz, FAQ, Trivia - Learn to make smart guesses and round numbers with fun examples and activities.
3. Estimating Differences - Online quiz for whole class activity or group practice.
4. Estimating by Rounding - addition with regrouping
5. Estimating by Rounding - subtraction with regrouping
6. Estimating Sum - no hints or clues given
7. Estimating Whole Number Sums & Differences - Addition & Subtraction Estimation
8. Estimation Worksheets. Create and Print your own Math Worksheet - You can customize these estimation worksheets for your needs.
9. Free Printable Estimation Worksheets for Grade 3 - Can print out worksheet or turn it into a quiz!
10. How To Use Estimation To Check The Reasonableness Of An Answer -Online video showing examples.
    
11. Math Story Problems! - Kid created math story problems ("Kitten" pages are the easiest.) There are lots of links to pages of problems... scroll way down to see them all
12. Round the decimal to the nearest whole number - matching, flashcards, or concentration (from Quia)
13. Rounding to nearest ten - to nearest hundred - to nearest thousand
14. The Seashell Rounding Activity Page - Look at the number on each shell. Click on the nearest ten.

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