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Algebra Play — Practice Quiz

CBSE · Class 8 · Mathematics

Try a 4-question quiz on Algebra Play for CBSE Class 8 Mathematics: tap an answer to check it and see why. 59 questions in the full chapter test.

59 questions68 flashcards10 formulas & key relations5 concepts

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Quick Quiz: Algebra Play

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Tap an answer to check it instantly. No sign-up needed for these 4.

1

A number trick says: think of a number, double it, add 4, divide by 2, and subtract the original number. If the starting number is 7, what is the final result?

2

In the date trick, the final number is 291. Use the rule 100M + 165 + D to find the date, where M is the month and D is the day.

3

Mukta reports the date-trick answer as 1390. What date did she start with? Use the rule 100M + 165 + D.

4

A 2x2 calendar grid has top-left number 18. What is the sum of all four numbers in the grid?

59 Questions·
multiple choicemultiple correct

Sample Questions

1multiple choice
3 marks

The sum of the numbers in a 2x2 calendar grid is 52. What is the top-left number?

Show answer

9

For a 2x2 calendar grid, the sum is 4a + 16. Set 4a + 16 = 52. Then 4a = 36, so a = 9. The top-left number is 9.

2multiple choice
3 marks

In a number pyramid, the top is 90 and the bottom row is 14, c, and 10, with the middle row values a and b. Find c, a, and b.

Show answer

c = 33, a = 47, b = 43

In a number pyramid, each number is the sum of the two numbers below it. So a = 14 + c, b = c + 10, and a + b = 90. Substitute: (14 + c) + (c + 10) = 90. That gives 24 + 2c = 90, so 2c = 66 and c = 33. Then a = 14 + 33 = 47 and b = 33 + 10 = 43.

3multiple choice
3 marks

For the number pyramid with top 60 and bottom row 12, c, 8, what are the values of c, a, and b?

Show answer

c = 20, a = 32, b = 28

The pyramid rules give a = 12 + c, b = c + 8, and a + b = 60. So (12 + c) + (c + 8) = 60. This becomes 20 + 2c = 60. Then 2c = 40, so c = 20. After that, a = 12 + 20 = 32 and b = 20 + 8 = 28.

4multiple choice
3 marks

A 2-digit number is written as ab. If the number is reversed to ba and b > a, what is the difference between the reversed number and the original number?

Show answer

9(b - a)

The original number is 10a + b and the reversed number is 10b + a. Their difference is (10b + a) - (10a + b) = 9b - 9a = 9(b - a). So it is always divisible by 9.

+55 more questions on Algebra Play (CBSE Class 8 Mathematics)

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Frequently Asked Questions

What are the important topics in Algebra Play for CBSE Class 8 Mathematics?
Key topics in Algebra Play include Think of a Number Tricks, Date-Guessing Trick, Number Pyramids, Virahāṅka-Fibonacci Sequence and Pyramids. Study these first, then practise questions on each for Class 8 exams.
How many practice questions are there for Algebra Play?
There are 59 questions on Algebra Play. Try the 4-question sample quiz on this page first; each answer shows an explanation when you tap it.

Sources & Official References

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

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All CBSE Class 8 Mathematics Practice Quiz

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