Class 3 Mathematics • Maths Mela • Chapter 12 • 2026–27
Answer-first chapter overview
Large additions and subtractions can be solved by breaking numbers into hundreds, tens and ones. Estimation helps check whether the final answer is reasonable.
Learning goals
Students practise three-digit addition and subtraction, regrouping, number-line strategies, inverse operations and word problems. The emphasis is on explaining a method, checking an answer and using mathematics in familiar situations.
Worked example
243 + 128 = 371. Check with subtraction: 371 − 128 = 243.
Hands-on activity
Create two shop stories using prices below 500. Solve one by addition and one by subtraction.
Practice questions
- Solve 356 + 247.
- Solve 700 − 286.
- Estimate 398 + 205 before finding the exact sum.
How should a student use this page?
Try the activity first, solve all three questions without copying, then explain one answer aloud. Use drawings, counters or a number line whenever they make the reasoning clearer.
Is this a substitute for the NCERT book?
No. This is an independently written learning companion for revision and practice. The official textbook remains the prescribed source.
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Official sources: official Chapter 12 PDF · CIET Maths Mela audio book
Original NCERT Kaksha study companion; no textbook passage or artwork is reproduced.