Adding & Subtracting Fractions — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. Emma ate 38 of a pie and Jake ate 48 of the same pie. How much did they eat altogether?
A) 716
B) 78
C) 18
D) 128
38 + 48: add numerators 3+4=7, keep denominator 8. Answer: 78.
2. A jar was 56 full. After pouring out 26, how full is the jar now?
A) 312
B) 36
C) 76
D) 26
56 − 26: subtract numerators 5−2=3, keep denominator 6. Answer: 36.
3. Sara ran 235 miles on Monday and 115 miles on Tuesday. What is the total distance?
A) 345 miles
B) 3410 miles
C) 325 miles
D) 445 miles
Add whole numbers 2+1=3, add fractions 35+15=45. Total: 345 miles.
4. A board is 458 feet long. You cut off 238 feet. How long is the remaining piece?
A) 228 feet
B) 288 feet
C) 688 feet
D) 2216 feet
Subtract whole numbers 4−2=2, subtract fractions 58−38=28. Answer: 228 feet.
Part B: Fill in the Blank
Write the correct answer on each line.
1. 29 + 59 = 79.
2+5=7, denominator stays 9. Answer: 79.
2. 437 + 127 = 557.
4+1=5, 37+27=57. Answer: 557.
3. 810 − 310 = 510.
8−3=5, denominator stays 10. Answer: 510.
4. 368 − 128 = 248.
3−1=2, 68−28=48. Answer: 248.
5. 14 + 14 + 14 = 34.
1+1+1=3, denominator stays 4. Answer: 34.