Subtraction Regrouping Practice
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Subtracting Numbers Made Easy: Regrouping Practice
🎯 WALT: We Are Learning To
We are learning to subtract larger numbers by regrouping accurately and checking our answers.
Strategy 1: Place-Value Partitioning
Example: 342 - 167
Step 1: Can't take 7 from 2, so rename 1 ten as 10 ones: 342 becomes 330 + 12
Step 2: 12 - 7 = 5, then 30 - 60... rename 1 hundred: 200 + 130 - 60 = 70, then 200 - 100 = 100
Answer: 175
Strategy 2: Column Method with Regrouping
Example: 524 - 178
4̶1̶4̶
524
- 178
-----
346
Cross out and rename: 4 becomes 14, 2 becomes 1, then 1 becomes 11, 5 becomes 4
Strategy 3: Check with Addition
Check: 346 + 178 = 524 ✓
Remember: difference + subtrahend = minuend
📝 Section A: Guided Practice (6 problems)
Hint: Regroup the tens first
Hint: You'll need to regroup twice
Hint: Start with the ones column
Hint: Regrouping across zero - be careful!
Hint: Multiple regrouping needed
Hint: Check your answer using addition
🔢 Section B: Independent Practice
🧩 Section C: Missing Numbers
📖 Section D: Word Problems
✅ Self-Check Box
📚 Teacher Notes & Differentiation
Curriculum Alignment: NZ-TMA-MATHEMATIC-Y4-6-number-012-DOC148 and NZ-TMA-MATHEMATIC-Y4-6-number-011-DOC148
Support Strategies:
• Use base-10 blocks or place value charts for concrete understanding
• Provide number lines for visual learners
• Allow extra time for dyslexic learners
• Use coloured pens to highlight different place values
Extension Activities:
• Create your own word problems using NZ contexts
• Explore subtraction with decimals (money problems)
• Investigate patterns in regrouping
• Try mental subtraction strategies for smaller numbers
📋 Answer Key
Section A: 1) 286 2) 337 3) 437 4) 355 5) 644 6) 267
Section B: 7) 377 8) 365 9) 374 10) 667
Section C: 11) 277 12) 811
Section D:
13) 1,245 - 867 = 378 more visitors on Saturday
14) $2,340 - $1,675 = $665 left
15) Challenge: First find market sales: 3,456 - 1,789 = 1,667 kg
Total sold: 1,667 + 645 = 2,312 kg
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