Question

what is the lowest common denominator of 2/32 plus 4/28

Answer 1

32 = 2x2x2x2x2
28 =2x2x7

so LCD = 2x2x2x2x2x7 = 224

btw, both of your fractions would have been reduced first to 1/16 and 1/7 with a LCD of 112