TO work out the HCF you need to split the numbers into their prime factors. In this case you have:
40 = 2x2x2x5
48 = 2x2x2x2x3
The next step is to identify any common prime factors. Both numbers have three 2s as prime factors. Multiply these together and you get:
2x2x2 = 8
Thus the HCF of 40 and 48 is 8.
LCM: 240 HCF is 8.
The GCF is 24.
The HCF of 48 and 72 is 24. The LCM is 144.
The GCF is 12.
6 is the HCF of 18 & 48
Since 16 is a factor of 48, it is automatically the GCF.
The GCF is 12.
The GCF is 12.
The GCF is 12.
The HCF of 40 & 12 is... 4
The hcf of 45 and 40 is 5.
HCF(40, 63) = 1