There are 3 prime numbers from 40 to 50:
41, 43 and 47
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There are 8 prime numbers between 10 and 40: 11 13 17 19 23 29 31 37.
There are 4 prime numbers between 20 and 40.
41,43,47,53,59,61,67,71,73,79
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.
41, 43 and 47 are the prime factors between 40 and 50