Adding & Subtracting Fractions — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. 214 + 124 = 334.
Add the whole numbers (2 + 1 = 3) and add the fractions (14 + 24 = 34) to get 334.
2. 568 − 238 = 338.
Subtract the whole numbers (5 − 2 = 3) and subtract the fractions (68 − 38 = 38) to get 338.
3. 137 + 327 = 457.
Add the wholes (1 + 3 = 4) and the fractions (37 + 27 = 57) separately to get 457.
4. 6710 − 4310 = 2410.
Subtract wholes (6 − 4 = 2) and fractions (710 − 310 = 410) to get 2410.
5. 325 + 225 = 545.
Add the whole-number parts (3 + 2 = 5) and the fraction parts (25 + 25 = 45) to get 545.
6. 456 − 136 = 326.
Subtract wholes (4 − 1 = 3) and fractions (56 − 36 = 26) to arrive at 326.
7. 249 + 339 = 579.
Combine the whole numbers (2 + 3 = 5) and add the ninths (49 + 39 = 79) to get 579.
8. 7312 − 5112 = 2212.
Subtract the wholes (7 − 5 = 2) and the fractions (312 − 112 = 212) to get 2212.
9. 113 + 213 = 323.
Add the whole numbers (1 + 2 = 3) and the thirds (13 + 13 = 23) to get 323.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
238 + 148
→ 378
235
545 − 315
→ 235
237
316 + 236
→ 546
378
457 − 227
→ 237
546
Add or subtract wholes and fractions separately: 2+1=3 and 38+48=78; 5−3=2 and 45−15=35; 3+2=5 and 16+36=46; 4−2=2 and 57−27=37.