" "11/2 + 1 3/8 + 1 3/4 + 1 1/4" "larr 112+138+134+114 ← write them in the same form
" "darr ↓
=5 1/2 + 1 3/8 + 1 3/4 + 1 1/4=512+138+134+114
= 8 (?+?+?+?)/8" "larr=8?+?+?+?8 ← add whole numbers, find the LCD
=8 (4+3+6+2)/8" "larr=84+3+6+28 ← make equivalent fractions.
= 8 15/8" "larr=8158 ← add the numerators
=8 +1 7/8=8+178
=9 7/8=978