Selina Concise Class 6 Math Chapter 8 H.C.F. and L.C.M. Exercise 8(A) Solution
Exercise 8-A
(1) Write all the factors of:
(i) 15- 1, 3, 5, 15.
(ii) 55- 1, 5, 11, 55.
(iii) 48- 1, 2, 3, 4, 6, 8, 12, 16, 24, 48.
(iv) 36- 1, 2, 3, 4, 9, 12, 18, 36.
(v) 84- 1, 2, 3, 4, 6, 7, 12, 14, 28, 42, 84.
(2) Write all the prime numbers:
(i) less than 25- 1, 2, 3, 5, 7, 11, 13, 17, 19, 23.
(ii) between 15 and 35- 17, 19, 23, 29, 31.
(iii) between 8 and 76- 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 57, 59, 61, 65, 67, 71, 73.
(3) Write the prime numbers from:
(i) 5 to 45- 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43.
(ii) 2 to 32- 3, 5, 7, 11, 13, 17, 19, 23, 29, 31
(iii) 8 to 48- 11, 13, 17, 19, 23, 29, 31, 37, 41, 43.
(iv) 9 to 59- 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 57, 59.
(4) Write the prime factors of:
(i) 16
Solution: Factors of 16- 2 x 2 x 2 x 2
Prime factors of 16 = 2.
(ii) 27
Solution: Factors of 27 – 3 x 3 x 3
Prime factors of 27 = 3
(iii) 35
Solution: Factors of 35 = 5 x 7
Prime factors of 35 = 5, 7
(iv) 49
Solution: Factors of 49- 7 x 7.
Prime factors of 49 is 7.
(5) If Pn means prime factors of n, find:
(i) P6 – Factors of 6 = 2, 3.
Prime factors of 6 – 2, 3.
(ii) P24
Factors of 24- 2 x 2 x 2 x 3
Prime factors of 24 = 2 and 3.
(iii) P50
Factors of 50 = 2 x 5 x 5
Prime factors of 50 = 2 and 5
(iv) P42
Factors of 42 = 2 x 3 x 7
Prime factors of 42 = 2, 3, 7