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Revision Notes

Number Play — Revision Notes

CBSE · Class 7 · Mathematics

Number Play revision notes for CBSE Class 7 Mathematics: 4 topics in quick points. Part of the CBSE Class 7 Mathematics syllabus.

34 questions64 flashcards3 formulas & key relations5 concepts

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Key Topics to Revise

1

1. Height-Arrangement Counting Rule

  • Each child says the number of children in front who are taller than them.
  • The number depends on the order of children, not on the total number of children alone.
  • A child who is tallest among the children in front says 0.
2

2. Even, Odd, and Parity

  • An even number can be arranged in pairs without leftovers.
  • An odd number cannot be arranged in pairs; it is one more than a collection of pairs.
  • Parity means whether a number is even or odd.
3

3. Parity of Sums and Differences

  • even + even = even
  • odd + odd = even
  • even + odd = odd
4

4. Grids, Row Sums, and Magic Squares

  • The sum of numbers 1 to 9 is 45.
  • In a solved 3x3 number grid using 1-9, the sum of all circled numbers is always 90.
  • The sum of the circled numbers across all three rows, or all three columns, is always 45.

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Full Notes

Key Concepts

Even numbers can be arrangedThe parity of a sum dependsThe sum of any odd numberTwo numbers one apart are consecutiveThe sum of numbers 1

Frequently Asked Questions

What are the important topics in Number Play for CBSE Class 7 Mathematics?
Key topics in Number Play include Height-Arrangement Counting Rule, Even, Odd, and Parity, Parity of Sums and Differences, Grids, Row Sums, and Magic Squares. Study these first, then practise questions on each for Class 7 exams.
How should I revise Number Play for Class 7 exams?
Learn the core ideas first, then work through the 34 practice questions on Number Play. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

More resources for Number Play

All CBSE Class 7 Mathematics Revision Notes

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