Question

12, 72
1 Find the common factors of the following pairs of numbers.
b 25, 50
c 66, 64
d 5, 12 e 75, 125 f 36,45 g 24,35 h 72,63
2 Find the HCF of the following pairs of numbers by listing the factors.
b 45, 81 c 18, 21 d 52, 78 e 69, 39
f 108,72 g 45,64 h 27,63
a 24, 72​

Answer 1

Step-by-step explanation:

12*6=72

b. 25=1,5,5,25

50=1,2,5,10,25,50

common factor=1,5,25

c.66=1,2,3,6,11,22,33,66

64=1,2,8,8,32,64

common factor =1,2

2.a 24=1,2,3,4,6,8,12,24

72=1,2,3,4,6,8,9,12,13,24,36,72

highest common factor=1,2,3,4,6,8,12,24

b 45=1,3,5,15

81=1,3,9,9,27,81

highest common factor=1,3

c 18=1,2,3,6,9,18

21=1,3,7,21

d 52=1,4,13,52

78=1,2,3,6,18,26,39,78

highest common factor=1

69=1,3,23,69

39=1,3,13,39

highest common factor=1,3

f 108=1,3,4,6,12,27,96,108

72=1,2,3,4,6,8,9,12,23,24,31,72

highest common factor=1,2,3,6,12

g 45=1,3,5,15

64=1,2,4,8,8,16,32,64

highest common factor=1,

h 27=1,3,7,21

72=1,2,3,4,6,8,9,12,24,36,72

highest common factor=1,2,3