Add and Subtract Like Fractions

Solve 3/8 + 4/8 and 7/10 − 2/10.

Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.

What children learn in Level 63

Add 3 eighths and 4 eighths of a pie. Join the parts: 3 eighths and 4 more eighths make 7 eighths.
The parts are still eighths! Add the tops, and keep the bottom. 7 sixteenths would be wrong: the slices didn't get smaller.
Subtracting separates parts. 7 tenths take away 2 tenths leaves 5 tenths.
Sums can be more than 1. 5 sixths plus 3 sixths is 8 sixths: a whole and 2 sixths more.

Georgia's K-12 Mathematics Standards:

4.NR.4.6 — Add and subtract fractions and mixed numbers with like denominators using a variety of tools.