140, 280, 420, 560, 700
30
the first 5 multiplies of 5 are 5, 10, 15, 20, 25
5 10 15 20 25 30
4 and 5
As a product of its prime factors: 2*2*5 = 20
-85
5, 10, 15, 20 and 25
the multiplies of 5 are just in the 5 times tables like 5x5=25
-21
30, 60, and 90.
30, 60 and 90
1 x 20, 2 x 10, 4 x 5 = 20