4 3/4 + 5 1/8 + 0 + 6 1/4 + ? = 22
You need to get them all to have a common denominator.
3/4, 1/8, 1/4
To get them to the smallest fraction (/8)
3*2/4*2 = 6/8
1*2/4*2 = 2/8
4 3/8 + 5 1/8 + 6 2/8 = 22
4 + 5 + 6 + 3/8 + 1/8 + 2/8 + ? = 22
15 + 5/8 + ? = 22
15 5/8 + ? = 22
Subtract 15 5/8 from both sides.
? = 6 3/8