Add:
`3/15 + 4/15`
= `(3 + 4)/15`
= `7/15`
`5 1/5+2 1/7`
Subtract:
`3 1/3-1 1/4`
Add: `5 1/2 + 2 3/4`
`3/9 + 3/5`
Add the following fractions
`1/7 + 3/7`
`3/9 + 7/9`
`2/9 + 1/9`
Solve:
`1/4 + 0/4`
Fill in the missing fraction.
`☐ + 5/27 = 12/27`
`2/3 + 1/7`