lible byPractice Time 2.5Find the common factors of the following:(a) 12 and 16(b) 15 and 21(c) 63 and 210(d) 4, 6 and 8(e) 15, 25 and 30(f) 24, 32, 442. Find the first three common multiples of the following:(a) 2 and 3(b) 15 and 203 Write all the numbers less than 100 which are common multiples of 4 and 5.4. Which of the following numbers are co-prime?(a) 4,9 (b) 8,15 (c) 18,81 (d) 40,515 (e) 73,213(6) 399,437-----PRIME FACTORISATIONThe factors of a number which are prime numbers are called prime factors.or erample, the factors of 48 are 1, 2, 3, 4, 6, 8, 12, 16, 24 and 48. You can see that only 2 and 3 are priumbers in all the factors. So, 2 and 3 are called prime factors of 48.milarly, the factors of 50 are 1, 2, 5, 10, 25 and 50.e, 2 and 5 are the only prime numbers. So, 2 and 5 are prime factors of 50.e factorisation is expressing a given number as the product of its prime factors.