Worksheet: Multiples & Factors | Mental Mathematics for Class 8 PDF Download

Q1: Answer the following question:
(i) Write first twelve multiples of 5.
(ii) Is 1 a prime number or composite number?
(iii) Is there an even prime number?

Q2: Fill in the blanks:
(i) 1 is a ________ number.
(ii) The smallest composite number is ________.
(iii) The smallest natural number is ________.
(iv) The smallest whole number is ________.
(v) The first 3 multiples of 12 are ________.
(vi) 3, 7, 9, 15, 25 are ________ numbers.
(vii) ________ is a factor of every number.
(viii) ________ is a factor of every even number.
(ix) A ________ number has only 2 factors one and the number itself.
(x) A composite number has more than ________ factors.
(xi) The factors of 6 are ________.
(xii) A number is a factor of another number if on dividing the ________ is zero.

Q3: Find prime factors of the following:
(i) 786
(ii) 256
(iii) 324
(iv) 546
(v) 484
(vi) 117

Q4: Complete the given multiplication grid.
(i) Find all the multiples of 3 yellow.
(ii) Circle all the even numbers greater than 50 but less than 80.
(iii) Write first 5 multiples of 7, 8 and 11.
(iv) Is 7 a factor of 35?
(v) Is 11 a factor of 47?
(vi) Is 9 a factor of 72?

Q5: Which of the following numbers are prime:
(i) 2
(ii) 6
(iii) 11
(iv) 15
(v) 39
(vi) 93
(vii) 57
(viii) 75
(ix) 81
(x) 87

Q6: Write all the factors of:
(i) 18
(ii) 20
(iii) 14
(iv) 23

Q7: Find out if the first number is a factor of the second number.
(i) 15, 180
(ii) 16, 112
(iii) 22, 133
(iv) 25, 230