Number Play

Why is learning "Number Play" important in mathematics?

1. It develops understanding of numbers, factors, multiples, divisibility, HCF, LCM, and logical thinking.
2. It is useful only for memorising tables.
3. It is needed only in higher classes.
4. It has no practical use.

Which number is NOT a prime number?

1. 19
2. 23
3. 29
4. 21

What is the common factor of 15 and 25?

1. 2
2. 3
3. 5
4. 7

Which method expresses a number as the product of prime numbers?

1. Addition
2. Prime factorisation
3. Subtraction
4. Estimation

Which statement about the number 1 is correct?

1. It is a prime number.
2. It is a composite number.
3. It is neither prime nor composite.
4. It has two factors.

Which of the following is a multiple of both 4 and 6?

1. 18
2. 20
3. 24
4. 30

Which of the following numbers is an even number?

1. 147
2. 189
3. 256
4. 311

Which number is divisible by 3?

1. 142
2. 234
3. 251
4. 413

Which divisibility rule is correct for 9?

1. Last digit must be 9
2. Sum of the digits must be divisible by 9
3. Last digit must be even
4. Number must end in 5

What is the LCM of 6 and 8?

1. 12
2. 18
3. 24
4. 48

What is the HCF of 18 and 24?

1. 2
2. 4
3. 6
4. 12

What is the smallest composite number?

1. 1
2. 2
3. 3
4. 4

Which of the following numbers is divisible by both 2 and 5?

1. 135
2. 240
3. 117
4. 333