517 37/50 + 312 3/100
dealing with just the whole numbers first...
517 + 312 = 829
now the fractions...
37/50 + 3/100.....common denominator is 100..so convert ur fractions so that they both have a denominator of 100, then u can add them
74/100 + 3/100 = 77/100
now we add our whole numbers to our fractions
829 + 77/100 = 829 77/100 <==
when ur adding mixed numbers, I find it easier to split the whole numbers from the fractions and do each separately. Thats is just my way...others may do it differenty