Page 74 - ICSE Math 5

Progress Worksheet

Mental Maths

1. Fill in the blanks.

(a) ________ and ________ are the factors of the dividend.
(b) ________ are the numbers that can be multiplied together to get a product.

(c) ________ is a multiple of every number.
(d) The product of two ________ numbers give their L.C.M.

(e) The product of H.C.F. and L.C.M. of two numbers is equal to the ________ of the
two numbers.

2. Write True or False.
(a) Composite numbers are the numbers having only two factors.

(b) Odd numbers are the numbers ending with the digits 1 and 3.
(c) Numbers such as 10, 12, 20, 364, 982 and 356 are some even numbers.

(d) The number 9,73,424 divisible by 8.
(e) A number is divisible by 6 if it is divisible by both 2 and 3.

3. Which of the following pairs are co-prime?

(a) 43 and 97 (b) 18 and 35 (c) 39 and 81 (d) 51 and 85
Solve and Answer

4. Find out whether the first number is a factor of the second number or not. Write Yes or
No.

(a) 54; 3,456 (b) 5; 335 (c) 82; 3,287 (d) 7; 987

5. Which of the following is not a multiple of 17?

(a) 107 (b) 131 (c) 85 (d) 327

6. Which of the following is not a factor of 28?
(a) 8 (b) 2 (c) 14 (d) 28

7. The LCM of two numbers is 1,750 and their HCF is 20. If one of the numbers is 200, find
the other number.

8. Find:
(a) the greatest 3-digit number and the product of its prime factors.
(b) the common factors of 18, 28, 46 and 58.

(c) the greatest number which can divide 366 and 579.

64