Addition and Subtraction Strategies
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Addition & Subtraction Strategies
Year 3 Mathematics — Homework Packet
🔢 Part 1: Partitioning Strategy
Partitioning means breaking numbers into hundreds, tens, and ones to make adding or subtracting easier.
Example: 243 + 135 → (200 + 100) + (40 + 30) + (3 + 5) = 300 + 70 + 8 = 378
Hundreds: _____ + _____ = _____
Tens: _____ + _____ = _____
Ones: _____ + _____ = _____
Answer: _____
Hundreds: _____ − _____ = _____
Tens: _____ − _____ = _____
Ones: _____ − _____ = _____
Answer: _____
Hundreds Tens Ones
_______ _______ _______
+ _______ + _______ + _______
= _______ = _______ = _______
Total: _____
🔄 Part 2: Regrouping & Rearranging
Regrouping is when you trade 10 ones for 1 ten (or 10 tens for 1 hundred) when adding or subtracting.
a) 347 + 285 = _____
b) 623 − 178 = _____
Now solve it: 199 + 46 = _____
Missing digit: _____
📖 Part 3: Word Problems
Read each problem carefully. Show your working and write a number sentence.
Number sentence: _____ + _____ = _____
Answer: ___________________________
Number sentence: _____ − _____ = _____
Answer: ___________________________
Step 1 (total saved): _____ + _____ = _____
Step 2 (after spending): _____ − _____ = _____
Answer: ___________________________
My number sentence: _____________________________
Answer: _____________________________
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