1. Indicate whether the number is divisible by 2, by 3, or by 5. (Note: Some numbers may be divisible by more than one of these numbers.)
a. 450
b. 31
c. 18,652
d. 455
2. Write out the prime factor of the following numbers.
a. 15
b. 21
c. 38
d. 42
3. What's the least common multiple of each group of numbers?
a. 5 and 6
b. 2 and 9
c. 6 and 8
d. 2, 5, and 6
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