Solve problems using estimation and comparison within a single set of data. (SPI 0406.5.2)

Links verified on 08/19/2026

1. Comparison Estimator - an activity which allows the user to compare two quantities by estimating
2. Estimate Differences - Estimate the difference by rounding each number to the nearest hundred and then subtracting
3. Estimate Differences - Estimate to solve word problems.
4. Estimation: Mixed Operations - Estimate sums, differences, products, and quotients to solve word problems.
5. Estimate Products - Estimate the product. Round the second factor to the nearest hundred, and then multiply.
6. Estimate Products - Estimate to solve word problems.
7. Estimate Quotients - Determine which sign makes the sentence true.
8. Estimate Quotients - Estimate to solve one-digit divisor problems.
9. Estimate Sums - Estimate the sum by rounding each number to the nearest hundred and then adding.
10. Estimate Sums - Estimate to solve word problems.
11. Estimate Sums and Differences of Decimals - Estimate the sum by rounding each number to the nearest whole number and then adding.
12. Estimation Topics - index of estimation activities, each of which includes a practice area and a quiz designed as a game
13. Estimator Four - This activity allows two users to play a game of estimation where each player tries to connect four game pieces in a row before his or her opponent does. The players earn game pieces by accurately estimating the answers to various problems. Users can choose to estimate addition, multiplication, and percentage problems.
14. How Many Pearls? - You've just stumbled on a treasure chest filled with pearls and you want a quick estimate of the number, without having to count them one by one. Choose a method to estimate.
15. More or Less Estimator - an activity which allows the user to estimate quantities and sizes including the number of objects in a set, the lengths of a curve, and the area of a shape

site for teachers | PowerPoint show | Acrobat document | Word document | whiteboard resource | sound | video format | interactive lesson | a quiz | lesson plan | to print