The only common multiple of 7 and 8 up to 80 is 56.
The multiples of 7 up to 80 are:
7 x 1 = 7
7 x 2 = 14
7 x 3 = 21
7 x 4 = 28
7 x 5 = 35
7 x 6 = 42
7 x 7 = 49
7 x 8 = 56
7 x 9 = 63
7 x 10 = 70
7 x 11 = 77
The multiples of 8 up to 80 are:
8 x 1 = 8
8 x 2 = 16
8 x 3 = 24
8 x 4 = 32
8 x 5 = 40
8 x 6 = 48
8 x 7 = 56
8 x 8 = 64
8 x 9 = 72
8 x 10 = 80
Multiples of 80 are 10 and 8
Just 56.
80
Any multiple of 80.
The multiples of 7 with a product less than 80 are: 7 x 1 = 7 7 x 2 = 14 7 x 3 = 21 7 x 4 = 28 7 x 5 = 35 7 x 6 = 42 7 x 7 = 49 7 x 8 = 56 7 x 9 = 63 7 x 10 = 70 7 x 11 = 77
The factors of 80 are: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80 Those which are multiples of 4 are: 4, 8, 16, 20, 40, 80
8, 16, 24, 32, 40, 48, 56, 64, 72, 80, 88, 96
8, 16, 24, 32, 40, 48, 56, 64, 72, 80, 88, 96.
8, 16, 24, 32, 40, 48, 56, 64, 72, 80, 88, 96.
The common multiples of an set of numbers are the multiples of their lowest common multiple. lcm(7, 8, 9) = 504 → the first 3 common multiples of 7, 8, 9 are 504, 1008, 1512.
40 and all its multiples...
40, 80, 120 and so on are multiples of both 8 and 10.