I think you need to speak to your teacher as you do not appear to understand the meaning of HCF.
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20
40
200 = 23 x 52 175 = 52 x 7 hcf = 52 = 25 lcm = 23 x 52 x 7 = 1400
The Highest Common Factor is 40
To find the HCF of two numbers you first need to express them as the product of their prime factors: 12 = 2x2x3 60 = 2x2x3x5 The next step is to identify any common factors. In this case, both numbers have two 2s and a 3 as prime factors. Multiply these together and you get 2x2x3=12 Thus the HCF of 12 and 60 is 12.
HCF is the highest common factor of two or more numbers. HCF of 20 and 200 is 20.
The HCF of 200 and 500 is 100
25
20
40
100
The GCF is 100.
10
The GCF is 5.
The GCF is 8.
Their HCF which is 10
200 = 23 x 52 175 = 52 x 7 hcf = 52 = 25 lcm = 23 x 52 x 7 = 1400