Add & Subtract Within 1000 — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. 432-128=304
Borrow 1 ten: 12-8=4. Tens 2-2=0. Hundreds 4-1=3. Difference 304.
2. 546-219=327
Borrow in ones: 16-9=7. Tens 3-1=2. Hundreds 5-2=3. Difference 327.
3. 623-147=476
Ones: 13-7=6 borrow 1. Tens: 1-4 needs borrow, 11-4=7. Hundreds: 5-1=4. Difference 476.
4. 705-328=377
Borrow from hundreds to tens, then tens to ones. 15-8=7, 9-2=7, 6-3=3. Difference 377.
5. 814-237=577
Ones: 14-7=7 borrow 1. Tens: 0-3 needs borrow, 10-3=7. Hundreds: 7-2=5. Difference 577.
6. 532-178=354
Ones: 12-8=4 borrow 1. Tens: 2-7 needs borrow, 12-7=5. Hundreds: 4-1=3. Difference 354.
7. 900-256=644
Borrow through zeros: 10-6=4 ones, 9-5=4 tens, 8-2=6 hundreds. Difference 644.
8. 671-389=282
Ones: 11-9=2 borrow 1. Tens: 6-8 needs borrow, 16-8=8. Hundreds: 5-3=2. Difference 282.
9. 480-295=185
Ones: 10-5=5 borrow 1. Tens: 7-9 needs borrow, 17-9=8. Hundreds: 3-2=1. Difference 185.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
613-248
→ 365
365
845-367
→ 478
478
732-196
→ 536
536
920-485
→ 435
435
613-248=365, 845-367=478, 732-196=536, 920-485=435. Use borrowing to confirm every match.