All of the composite numbers less than 100 have factor pairs.
2 5 6
2 and 7 are prime numbers less than 10 that are factors of 42 and 70.
When they have a common prime factor. When their GCF is greater than 1.
3,9,27,81,243,729
All of the composite numbers less than 100 have factor pairs.
80 has 5 factor pairs.
12 and 18 have three factor pairs.
12 and 18 have three factor pairs.
12 and 24 12 and 36 24 and 36
4 and 6 6 and 8 Any time the two numbers have a common factor, their LCM will be less than the product because the common factor contributes to the LCM fewer times than it contributes to the product.
The number 18.
12 and 18
12, 16, 18
Numbers less than 100 having 19 as a factor are 19, 38, 57, 76, and 95.
Eight pairs.
1 and 1