Add & Subtract Within 1000 — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. 246+137=383
6+7=13, write 3 carry 1. 1+4+3=8 tens. 2+1=3 hundreds. Sum 383.
2. 358+129=487
8+9=17, write 7 carry 1. 1+5+2=8 tens. 3+1=4 hundreds. Sum 487.
3. 475+216=691
5+6=11, write 1 carry 1. 1+7+1=9 tens. 4+2=6 hundreds. Sum 691.
4. 189+204=393
9+4=13, write 3 carry 1. 1+8+0=9 tens. 1+2=3 hundreds. Sum 393.
5. 367+118=485
7+8=15, write 5 carry 1. 1+6+1=8 tens. 3+1=4 hundreds. Sum 485.
6. 248+165=413
8+5=13 write 3 carry 1. 1+4+6=11 write 1 carry 1. 1+2+1=4. Sum 413.
7. 276+354=630
6+4=10 write 0 carry 1. 1+7+5=13 write 3 carry 1. 1+2+3=6. Sum 630.
8. 429+275=704
9+5=14 write 4 carry 1. 1+2+7=10 write 0 carry 1. 1+4+2=7. Sum 704.
9. 158+237=395
8+7=15 write 5 carry 1. 1+5+3=9 tens. 1+2=3 hundreds. Sum 395.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
146+238
→ 384
384
259+183
→ 442
442
367+295
→ 662
662
478+356
→ 834
834
146+238=384, 259+183=442, 367+295=662, 478+356=834. Careful regrouping gives the right match.