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

1. Animal Legs - use repeated addition as a strategy to solve multiplication story problems
2. Basket Math provides rounding practice
3. Comparison Estimator - Similar to Estimator but compares two sets of objects.
4. Estimate - [use as a whole class activity] Select a range, display tick marks and estimate before revealing the answer.
5. Estimating by Rounding - addition with regrouping
6. Estimating by Rounding - subtraction with regrouping
7. Estimating and rounding decimals - a lesson, examples, and an interactive practice page
8. Estimating Sum - no hints or clues given
9. Estimator - Practice estimation skills by determining the number of objects, length, or area. (parameters: error tolerance)
10. Guess the Number - developing skills in halving and estimation
11. Home Run Derby Math - you don't have time to add, just estimate the correct answer [addition, subtraction, or multiplication]
12. Laser Beams - rounding decimals to the nearest whole number - three levels are available; rounding, rounding and computing sums and differences, and rounding and computing with all four operations
13. Let's Go Shopping - estimate by rounding to the nearest dollar as they shop
14. 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
15. More or Less Estimator - Similar to Estimator activity but states a quantity and asks the user to estimate whether the set of objects is more or less than the number given.
16. Round About - estimate by rounding
17. Round the decimal to the nearest whole number - matching, flashcards, or concentration (from Quia)
18. Rounding - to the nearest ten or dollar, a quiz from Saxon math
19. Rounding to nearest ten - to nearest hundred - to nearest thousand
20. Rounding Off - three levels are available in this game from BBC Education
21. The Seashell Rounding Activity Page - Look at the number on each shell. Click on the nearest ten.

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