Number Play — Practice Quiz
CBSE · Class 7 · Mathematics
Try a 4-question quiz on Number Play for CBSE Class 7 Mathematics: tap an answer to check it and see why. 34 questions in the full chapter test.
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Quick Quiz: Number Play
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In a line of 6 children arranged by height, if each child calls out the number of children taller than them standing in front, what number will the 3rd child (from left) say if the heights from left to right are: 120cm, 135cm, 125cm, 140cm, 130cm, 145cm?
Can 5 odd numbers add up to 30?
In a 4×7 grid, what is the parity of the total number of small squares?
In how many ways can you climb 4 steps if you can take 1 or 2 steps at a time?
Sample Questions
Which of the following statements about parity are correct?
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Sum of two odd numbers is even, Sum of an odd and even number is odd, Product of two odd numbers is odd
Odd + Odd = Even (pairs form), Even + Even = Even, Odd + Even = Odd (one leftover), Odd × Odd = Odd, and three odds sum to odd.
If the centre of a 3×3 magic square using numbers 1-9 is 5, what is the magic sum?
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15
Sum of 1-9 is 45. In a magic square, each row sum equals 45÷3 = 15.
Which numbers can appear at the center of a 3×3 magic square using digits 1-9?
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Only 5
The center appears in 4 lines (2 diagonals, 1 row, 1 column). Only 5 can satisfy all required sums of 15.
What is the parity of the expression 4n + 7 for any integer n?
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Always odd
4n is always even (multiple of 4). Even + 7 (odd) = Odd. So 4n + 7 is always odd.
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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