The factors of 7 are 1 and 7. Neither of them are multiples of 42. Put the other way, 7, 14, 21 and 42 are multiples of 7 that are factors of 42.
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The only number that could be both a factor and a multiple is 7 itself.
' 1 ' and ' 7 ' qualify.
Since 7 is a factor of 28 itself. Therefore the lowest common multiple will be 28.
The least common multiple of 7 and 9 is 63. The GCF of 7 and 9 is 1.
4 is a factor of 28. 4 is a divisor of 28. 7 is a factor of 28. 7 is a divisor of 28. 28 is a multiple of 7. 28 is a multiple of 4. 28 is a product of 4 and 7. 28 is divisible by 4. 28 is divisible by 7.