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Formula Sheet

Number Play — Formula Sheet

CBSE · Class 8 · Mathematics

10 formulas from Number Play (CBSE Class 8 Mathematics) on one page, grouped by topic. Part of the CBSE Class 8 Mathematics syllabus.

69 questions70 flashcards10 formulas & key relations5 concepts

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10 Entries · 4 Sections

Formulas and Key Relations

2. Parity of Expressions with + and -

(a + b - c - d) - (a - b - c - d) = 2b

odd ± odd = even

even ± even = even

odd ± even = odd

a ± b have the same parity

3. Even Numbers and Multiples of 4

4p + 4q = 4(p + q)

(4p + 2) + (4q + 2) = 4p + 4q + 4 = 4(p + q + 1)

4. Divisibility by 10, 3, and 9

General number place value expansion: ... + 1000d + 100c + 10b + a

General 5-digit number in Indian place value system: e × 10000 + d × 1000 + c × 100 + b × 10 + a

Sums of Consecutive Numbers

Examples include 7 = 3 + 4, 10 = 1 + 2 + 3 + 4, 12 = 3 + 4 + 5, and 15 = 7 + 8 = 4 + 5 + 6 = 1 + 2 + 3 + 4 + 5.

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Frequently Asked Questions

What are the important topics in Number Play for CBSE Class 8 Mathematics?
Key topics in Number Play include Sums of Consecutive Numbers, Parity in Expressions with Plus and Minus, When Two Even Numbers Give a Multiple of 4, Divisibility by 10, 9, 3, and 11. Study these first, then practise questions on each for Class 8 exams.
How many formulas are in Number Play?
This sheet lists 10 formulas from Number Play, grouped by topic. Learn what each symbol stands for so you can apply the formula, not just recall it.
How should I revise Number Play for Class 8 exams?
Learn the core ideas first, then work through the 69 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 8 Mathematics Formula Sheet

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