Curated OER
Estimate Differences
In this estimating differences instructional activity, students estimate differences by rounding to the nearest hundred. Answers are included on page 2.
Curated OER
Estimate Differences
For this estimation worksheet, students solve a total of 6 word problems that involve rounding to a given place value and estimating.
AAA Math
Aaa Math: Estimating a Difference
Students can practice estimating differences in a series of self-check exercises and timed learning games.
AAA Math
Aaa Math: Subtraction Using Estimation
This site explains how to estimate differences by rounding. Games and exercises are provided to practice the skill.
AAA Math
Aaa Math: Front End Estimation: Differences
Students use front-end estimation to solve subtraction problems. Learning exercises and games are provided to practice the skill.
ClassFlow
Class Flow: Estimating Sums and Differences
[Free Registration/Login Required] This flipchart is designed to teach third grade students the steps in estimating sums and differences. It also reviews rounding numbers to the nearest ten and hundred.