168
The Least Common Multiple (LCM) of (7,9,10) is 630.
119
280
420
Which you don't want. You want the least common denominator, which is 360.
The least common multiple of 7 , 8 , 10 , 12 = 840
The Least Common Multiple (LCM) of (7,9,10) is 630.
42
14
84
It is: 91
28
119
Their product.
84
It is 70
28