Question

what is the least common mulitple of 7,8,10

Answer 1

the easiest way is to make a chart like so:

Answer 2

7: 14, 21, 28, 35, 42, 49, 56, etc
8: 16, 24, 32, 40, 48, etc
10: 20, 30, 40, 50, 60, etc
and you do that untill you find the common multiple all three have

Answer 3

it should be 280 , an faster way would be to use a factor tree i believe.

Answer 4

7=7*1
8=2^3
10=5*2
then use all the result values like so:
7*2^3*5= 280