10, 20, 30, 40, 50, 60
60 and 42 have no common multiples under 100.
Multiples of 9 up to 100 are 9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99. Multiples of 10 up to 100 are 10, 20, 30, 40, 50, 60, 70, 80. 90, 100. The only common multiple up to 100 of 9 and 10 is 90.
28 and 56
28 and 56
They are: 15, 30, 45, 60.
Just 90.
No - common multiples of 4 & 12 up to 100 are... 12, 24, 36, 46, 60, 72, 84 & 96
15, 30, 45, 60, 75, 90
The common multiples of 6 and 5 are 30, 60, 90, 120, 150, 180, and so on.
10, 20, 30, 40, 50, 60, 70, 80, 90, 100.
If half of the sum is 90 then the full sum must be 180. The three consecutive multiples of 10 which add up to 180 are 50, 60 and 70.
There is an infinite number of common multiples for 10 and 15. A common multiple of any two or more numbers is any number into which each of two or more numbers can be divided evenly (zero remainder). Any multiple of 30.