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The World of Numbers — Practice Quiz

CBSE · Class 9 · Mathematics

Try a 4-question quiz on The World of Numbers for CBSE Class 9 Mathematics: tap an answer to check it and see why. 89 questions in the full chapter test.

89 questions76 flashcards10 formulas & key relations5 concepts

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Quick Quiz: The World of Numbers

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1

A spice trader takes a loan of ₹850, then earns a profit of ₹1,200, and later suffers a loss of ₹450. What is his final financial standing?

2

A tailor has 15 3/4 m of silk and uses 2 1/4 m for each kurta. How many kurtas can he make?

3

Find the value of 7/9 × (6/7 - 3/4).

4

A rational number between 1 and 3/2 is found by taking their average. What is the number?

89 Questions·
multiple choicemultiple correcttrue falsenumerical

Sample Questions

1multiple choice
3 marks

A decimal 2.35 overline 7 is converted into a fraction. What is its value as p/q?

Show answer

1061/450

Let x = 2.35 overline 7. Multiply by 100 to move the non-repeating digits: 100x = 235.overline 7. Multiply again by 10: 1000x = 2357.overline 7. Subtract: 1000x - 100x = 2357.overline 7 - 235.overline 7 = 2122. So 900x = 2122 and x = 2122/900 = 1061/450.

2multiple correct
3 marks

A fraction 2/3 is compared with 4/6. Which statement about these rational numbers is correct?

Show answer

They are equal, They satisfy ad = bc

Check equality using cross multiplication: 2 × 6 = 12 and 3 × 4 = 12. Since ad = bc, the fractions are equal. Different denominators do not mean different values.

3multiple correct
3 marks

Which properties are true for rational numbers?

Show answer

They are closed under addition, They are closed under subtraction, They are closed under multiplication

Rational numbers remain rational after addition, subtraction, and multiplication. They are also closed under division as long as division by zero is avoided. So the statement that they are never closed under division is false.

4multiple correct
3 marks

A fraction 3/20 is written as a decimal. Which statements are correct?

Show answer

It equals 0.15, It is a terminating decimal, Its denominator has only 2 and 5 as prime factors after simplification

3/20 = 3/(2^2 × 5). Multiplying numerator and denominator by 5 gives 15/100 = 0.15. Since the denominator can become a power of 10, the decimal terminates.

+85 more questions on The World of Numbers (CBSE Class 9 Mathematics)

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Frequently Asked Questions

What are the important topics in The World of Numbers for CBSE Class 9 Mathematics?
Key topics in The World of Numbers include Growth of Number Systems, Zero and Integers, Rational Numbers, Irrational Numbers. Study these first, then practise questions on each for Class 9 exams.
How many practice questions are there for The World of Numbers?
There are 89 questions on The World of Numbers. 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 9 Mathematics Practice Quiz

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