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To get the Least Common Multiple (LCM) of 9 and 9900 we need to factor each value first and then we choose all the factors which appear in any column and multiply them:
|9: || || ||3||3|| || || |
The Least Common Multiple (LCM) is: 2 x 2 x 3 x 3 x 5 x 5 x 11 = 9900