(b) Hence, find the HCF of 176 and 100.
this just means find the prime factors of 100, then multiply whatever prime factors that are the same as 176's prime factors.
100
/ \
2 50 The prime factors of 100 are 2, 2, 5, 5
/ \ The prime factors of 176 are 2, 2, 2, 2, 11
5 10 We cross out the ones that do not match
/ \ So, the HCF would be 2 x 2 x 2 x 2 or 2⁴, 2⁴ = 8
2 5
So the HCF of 176 and 100 is 8
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