Just ninety.
the common multiples between 1 and 100 for 9 and 10 are just 90!
90
The common multiples of 1 and 100 are any multiple of 100.
Just 90.
Just 90.
Just 90
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.
Just 90.
90 that is all
Just 90.
Just 90.
Multiples of 20 are 20, 40, 60, 80 and 100. For them to be common, they need to be compared to another set of multiples.