Any multiple of 10.
All of the composite numbers less than 100 have factor pairs.
2 and 7 are prime numbers less than 10 that are factors of 42 and 70.
Yes.
3,9,27,81,243,729
When they have a common prime factor. When their GCF is greater than 1.
All of the composite numbers less than 100 have factor pairs.
Numbers less than 100 having 19 as a factor are 19, 38, 57, 76, and 95.
2 and 7 are prime numbers less than 10 that are factors of 42 and 70.
3,9,27,81,243,729
Yes.
When they have a common prime factor. When their GCF is greater than 1.
Smaller. Just try it out with some numbers; for example, 0.5 x 20 = 10 (10 is less than 20).
1
92
When they have a factor in common greater than one.
54 and 63
1 is the number less than fifty with the fewest number of factors. All other numbers have at least two factors (1, and the integer itself).