This can be done in your head by breaking the question down a bit.
24 x 198 = 24 x 200 - 24 - 24 = 10 x 2 x 200 + 800 - 24 - 24 = 4000 + 800 - 48 = 4752
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198 - 30% = 198 x (1 - (30/100)) = 198 x 0.7 = $138.60.
How about: 18 times 11 = 198
The multiples of 198 are 396 (2 X 198), 594 (3 X 198), 792 (4 X 198), etc. There is not a least common multiple because to have an LCM, there must be two or more original numbers.
198
= 198 x 100/302 = 65.562914 %