Students add three-digit numbers with regrouping. Part A asks them to fix three addition errors by working through the regrouping process column by column. Part B has four fill-in-the-blank addition problems including 247 + 135 and 368 + 214. Part C presents three true-or-false statements about whether regrouping is needed and basic place-value addition facts.
This sheet builds systematic column-by-column addition before introducing subtraction with borrowing.
Style:
Three-Digit Addition & Subtraction
Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1. Fix the sentence:
345 + 278 = 513.
Rewrite: 345 + 278 = 623 because 5 + 8 = 13, carry 1, then 4 + 7 + 1 = 12, carry 1, then 3 + 2 + 1 = 6.
2. Fix the sentence:
156 + 237 = 383.
Rewrite: 156 + 237 = 393 because 5 + 3 = 8, not 7, so the tens digit should be 9.
3. Fix the sentence:
489 + 234 = 613.
Rewrite: 489 + 234 = 723 because 9 + 4 = 13, carry 1, then 8 + 3 + 1 = 12, carry 1, then 4 + 2 + 1 = 7.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. 247 + 135 = 382.
2. 368 + 214 = 582.
3. 153 + 429 = 582.
4. 276 + 518 = 794.
Part C: True or False?
Read each statement. Circle True or False.
1. When adding 567 + 245, you need to regroup in the ones place because 7 + 5 = 12.
True False
2. 321 + 456 = 787.
True False
3. The sum of 400 + 300 is 700.
True False
Three-Digit Addition & Subtraction
★ Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1) Fix the sentence:
345 + 278 = 513.
Rewrite: 345 + 278 = 623 because 5 + 8 = 13, carry 1, then 4 + 7 + 1 = 12, carry 1, then 3 + 2 + 1 = 6.
2) Fix the sentence:
156 + 237 = 383.
Rewrite: 156 + 237 = 393 because 5 + 3 = 8, not 7, so the tens digit should be 9.
3) Fix the sentence:
489 + 234 = 613.
Rewrite: 489 + 234 = 723 because 9 + 4 = 13, carry 1, then 8 + 3 + 1 = 12, carry 1, then 4 + 2 + 1 = 7.
★ Part B: Fill in the Blank
Write the missing word or number on each line.
1) 247 + 135 = 382.
2) 368 + 214 = 582.
3) 153 + 429 = 582.
4) 276 + 518 = 794.
★ Part C: True or False?
Read each statement. Circle True or False.
1) When adding 567 + 245, you need to regroup in the ones place because 7 + 5 = 12.
True
False
2) 321 + 456 = 787.
True
False
3) The sum of 400 + 300 is 700.
True
False
Ready to Practice?
Complete each section carefully.
10 Questions
15-20 minutes
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