The highest common factor (abbreviated to HCF) is the largest number that goes into two or more subject-numbers. For example, the common factors of 40 and 16 are 2, 4 and 8. The HCF of 40 and 16 ...
The difference is 24 – 21 = 3. The first factor pair is 1 ... Neither 1 nor 15 are prime. 1 has one factor. 15 has more than two factors, (1, 3, 5, 15). 16 = 3 + 13. Both 3 and 13 are prime.
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