99 (= 11 x 9) is the largest multiple of 11 less than 100.
99... which is 11 x 9 !
No.
All of the odd multiples of 9 are odd numbers. The largest odd multiple of 9 that's less than 100 is 99 ... the 11th multiple. So the ones that qualify are: 1, 3, 5, 7, 9, and 11 . . . six of them.
The largest common multiple of 6 and 9 is an infinite amount.
Infinity times nine!
108 is the multiple of 9 between 100 and 110
99.... 9 times 11
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.
They also add up to a multiple of 9.
They are: 18 27 36 45 54 63 72 81 90 and 99
The lowest common multiple of 4, 2, 9, 5 and 100 is 900. Since 4, 2 and 5 are factors of 100, you can ignore them. Then all you have to do is multiply 9 times 100.