Estimating Difference
Examples, solutions, videos, stories, and songs to teach Grade 3 students how to estimate difference.
The following diagram shows how to decompose fractions using area models to show equivalence. Scroll down the page for more examples and solutions.
Estimating Sums and Differences
- 745 + 386
- 9,341 + 5,871
- 431 - 261
- 6,482 - 3,102
Estimating Sums and Differences
- Billy has 17 toy cars. Jordan has 31 toy cars. What is a good estimate for the number of toy cars both boys have?
- This morning the donut shop sold 376 sugar donuts and 514 glazed donuts. Approximately how many donuts were sold?
- Casey and Fred scored 586 points on a vidoe game. Jason and Stacey scored 123 less points. What is a good estimate of how many points Jason and Stacey scored when rounded to the nearest 10.
Estimating Addition and Subtraction Problems
This video explains how to round whole numbers to estimate addition and subtraction problems.
- Estimate the sum by rounding to the tens:
34 + 73 - Estimate the difference by rounding to the thousands
14,389 - 6,846 - Estimate the difference by rounding to the ten thousands
7,004,585 + 86,942 - Estimate the difference by rounding to the thousands
89,489 - 23,892
Check out our most popular games!
Fraction Concoction Game:
Master fractions in the lab: mix, add, and subtract beakers to create the perfect concoction!
Fact Family Game:
Complete fact families and master the link between addition & subtraction and multiplication & division.
Number Bond Garden:
Clear the board by matching number pairs that sum to ten in this garden-themed mental math puzzle.
Online Addition Subtraction Game:
Practice your addition and subtraction skills to help the penguin find its mummy.
We welcome your feedback, comments and questions about this site or page. Please submit your feedback or enquiries via our Feedback page.