Estimating Sums and Differences Worksheets
Practice estimating sums and differences using explicit place-value reasoning.
Before you begin
Recognize digits and read a place-value chart.
Worked example
Estimate 365 + 266 by first rounding each number to the nearest 10.
- 365 rounds to 370; 266 rounds to 270.
- Use the rounded values in the operation.
Answer: 640
Check your result using the method in the example before moving to the next question.
Choose your level
These sets use the same exercise types and number ranges across level labels. Choose a fresh set for additional practice.
- Easy: Start with the preview and follow the worked example.
- Medium: Practice the same exercise types with a fresh numbered set.
- Hard: Use another set to practice explaining and checking your answers.
Questions and answer calculations checked on 2026-09-17. How we check worksheets. Free for personal and classroom use.
Preview and print an easy set
Try six questions below, or choose a full set at your level.
1
Estimate 734 + 553 by first rounding each number to the nearest 10.
2
Estimate 797 − 600 by first rounding each number to the nearest 10.
3
Estimate 480 + 325 by first rounding each number to the nearest 10.
4
Estimate 982 − 311 by first rounding each number to the nearest 10.
5
Estimate 714 + 578 by first rounding each number to the nearest 10.
6
Estimate 386 − 163 by first rounding each number to the nearest 10.
Answer Key
1. 12802. 2003. 8104. 6705. 12906. 230