28
3. Find the HCF using prime factorisation method.
(a) 16 and 60
(b) 25 and 65
(d) 150 and 225
(e) 210 and 480
(g) 144 and 198
(h) 144, 180 and 192
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Find the HCF using division method.
(a) 36 and 63
(b) 119 and 187
(d) 1045 and 1520 (e) 180, 252 and 576
(g) 136 and 170
(h) 1020 and 11594
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Answer:
3.
A) Prime Factorization of 16 are: 2 x 2 x 2 x 2
Prime Factorization of 60 are: 2 x 2 x 3 x 5
HCF = 4
B) Prime Factorization of 25 are: 5 x 5
Prime Factorization of 65 are: 5 x 13
HCF = 5
D) Prime Factorization of 150 are: 2 x 3 x 5 x 5
Prime Factorization of 225 are: 3 x 3 x 5 x 5
HCF = 75
E) Prime Factorization of 210 are: 2 x 3 x 5 x 7
Prime Factorization of 480 are: 2 x 2 x 2 x 2 x 2 x 3 x 5
HCF = 30
G) Prime Factorization of 144 are: 2 x 2 x 2 x 2 x 3 x 3
Prime Factorization of 198 are: 2 x 3 x 3 x 11
HCF = 18
H) Prime Factorization of 144 are: 2 x 2 x 2 x 2 x 3 x 3
Prime Factorization of 180 are: 2 x 2 x 3 x 3 x 5
Prime Factorization of 192 are: 2 x 2 x 2 x 2 x 2 x 2 x 3
HCF = 12
4.
A) 9
B) 17
D) 95
E) 36
G) 34
H) 34
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