Year 3 · Maths

Estimate And Check Answers

Year 3 learners practise estimating and checking answers using inverse operations.

The activities include Check Subtractions by Using Addition, Estimate Addition Questions Using Rounding to Nearest Ten, Estimate Additions by Rounding to the Nearest 100, and related practice. The checked support below includes video, worksheet, teaching, lesson. Open a resource in its provider's website and choose the format that best helps the learner explain the idea independently.

Activities covered

Check Subtractions by Using Addition
Estimate Addition Questions Using Rounding to Nearest Ten
Estimate Additions by Rounding to the Nearest 100
Estimate Additions Using Rounding
Round Numbers to Estimate Addition and Subtraction Problems
Round Numbers with Three Digits to Estimate Subtraction Questions
Use Addition to Check Subtractions
Use Knowledge of Numbers to Estimate Answers and Check Using the Inverse Operation.

Checked learning resources

Check Answers Using the Inverse

Oak National Academy · Video · Opens on the provider website

The exact Year 3 Oak lesson video teaches using addition and subtraction as inverse operations to check calculations.
Check Answers Using the Inverse: Worksheet and Quizzes

Oak National Academy · Worksheet · Opens on the provider website

The browser-first downloads page provides worksheet, starter-quiz and exit-quiz practice for using addition and subtraction as inverse operations to check calculations.
Check Answers Using the Inverse: Year 3 Unit

Oak National Academy · Teaching · Opens on the provider website

The Year 3 unit sequence places using addition and subtraction as inverse operations to check calculations within a coherent progression.
KS2 Rounding and Estimating

BBC Bitesize · Teaching · Opens on the provider website

BBC teaching explains rounding to tens and hundreds and estimating calculations.
Year 3 Checking Calculations Lesson

Twinkl · Worksheet · Account may be required

The lesson uses rounding, estimation and inverse operations to check addition and subtraction.
Year 3 Maths Inverse Addition and Subtraction Lesson Pack

Twinkl · Lesson · Opens on the provider website

Year 3 Maths resource matched to estimating and checking answers using inverse operations.
Y3 Using Inverse to Check Addition and Subtraction Lesson Pack

Twinkl · Lesson · Opens on the provider website

Year 3 Maths resource matched to estimating and checking answers using inverse operations.
Estimating Whole Number Sums and Differences

YouTube — Math with Mr. J · Video · Opens on the provider website

Worked lesson rounds numbers before estimating both addition and subtraction answers.