The LCM of 3 and 42 is 42.
No, but 42 is a multiple of 3, and 3 is a sub-multiple of 42 (14 x 3 = 42)
The factors of 42 are 1, 2, 3, 6, 7, 14, 21, and 42. The composite factors from this list are 6, 14, 21, and 42.
The GCF is 3.
42 1*42 = 42 3*42 = 126 5*42 = 210
5/6ths
If you convert both numbers into 6ths it is easier to work out. 1 and 1/2 is 9/6ths and 2/3rds is 4/6ths. so, 9/6ths - 4/6ths = 5/6ths.
You have to find the common denominator for the fractions, so multiply the "half" (2) by the "thirds" (3). These two numbers multiplied with give 6 as a common denominator. Then multiply the 1 by the 3, which will give 3/6ths, and the 2 by the other 2, which will give 4/6ths. Hmmm! it seems that 4/6ths is greater than 3/6ths, so you have to add a whole to the 3/6ths to make a big enough fraction to subtract. Doing that will give you 9/6ths and you can subtract the 4/6ths. So the answer would be 5/6ths. Try it.
3/6 + 1/3 = 3/6 + 2/6 = 5/6 5 6ths is your answer
12 and 1 half minus 3 and 5 6ths = 8 2/3
3/6 = 50%
2/3
3
34/6 + 15/6 = 53/6
3/6 is 1/2 simplified
1/3
2/3