Chapter 16 – Playing with Numbers

Which of the following is divisible by 12?

By which of the following number 168 is divisible?

Write in the usual form: 100 × 7 + 10 × 1 + 8

Write in the usual form: 10×5 + 6

When is a number always divisible by 90?

What value should be given to ” * ” so that the number 653 ∗ 47 is divisible by 11?

By which of the following number 9042 is not divisible? 2, 3, 6, and 9

Write in generalised form: 25

Which of the given numbers is composite?

The generalised form of the number 33 is

If a number is divisible by 9, it is also divisible by which number?

32 + m is a prime number. What is the least value of ‘m’?

Which of the following is not prime?

Identify the missing digit in the number 234,4_6, if the number is divisible by 4.

By which of the following numbers is 477 not divisible?

N is a 5-digit number divisible by 5. If N is bigger than 10000 and smaller than 10010, what is the value of N?

Write in generalised form: 85

Which of these numbers is divisible by 6?

If the division N ÷ 5 leaves a remainder of 0, what might be the one’s digit of N?

Which of the following statements is false?

Question 21.The generalised form of the number 52 is

Question 22.The generalised form of the number 33 is

Question 23.The number 10 × 7 + 5 in usual form is

Question 24.The number 10 × 2 + 7 in usual form is

Question 25.The generalised form of the number 123 is

Question 26.The generalised form of the number 234 is

Question 27.The number 3 × 100 + 4 × 10 + 5 in usual form is

Question 28.The number 5 × 100 + 7 × 10 + 9 in usual form is

Question 29.The number 100 × a + 10 × 6 + c in usual form is

Question 30.The number 100 × b + 10 × c + a in usual form is