Answer: 108
Explanation:
Given : Reptile stickers come in sheets of 6 and fish stickers come in sheets of 9.
To find : The least number of sheets of each type he might buy.
We first find the L.C.M. of 6 and 9.
Since ,
;

Then,

But he buys at least 100 of each type, then we recall the multiples of 18 to find the least number which is nearest to 100.
Multiples 18=

Here 1908 is the least number i.e. both more than 100 and nearest to 100.
Therefore, the least number of sheets of each type he might buy = 108