756 / 42 can be simplified to 108 / 6 (as they are both divisible by 7). Then to 18 / 1 when you divide out the 6. So the answer would be 6.
756
14
0.0238
42*18 = 756
Half of 756 is 378. All you do to find the answer is 756 divided by 2.
252
0.756
84
0.0952
The least common multiple of 28, 42, and 108 is 756.
252
9.6923