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3-Digit Addition Subtraction Strategies

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3-Digit Addition Subtraction Strategies

3-Digit Addition Subtraction Strategies

Children solving maths problems with blocks and number charts

🧮 Part 1: Addition Strategies

1. Use the column method to solve: 245 + 138
2. Break apart the numbers to add: 367 + 125

Strategy: 367 = 300 + 60 + 7 and 125 = 100 + 20 + 5

300 + 100 = _______

60 + 20 = _______

7 + 5 = _______

Total: _______ + _______ + _______ = _______

3. Circle the best strategy for adding 456 + 299:

Add 456 + 300, then subtract 1

Count on from 456

Use tally marks

➖ Part 2: Subtraction Strategies

4. Use the column method to solve: 524 - 187
5. Use the jump strategy on a number line to solve: 435 - 128

Start at: 435

Jump back: 100, then 20, then 8

Answer: _______

6. Which subtraction problems need regrouping? Check all that apply:

567 - 234

423 - 156

789 - 321

345 - 167

🎨 Part 3: Picture Strategies

7. Draw base-10 blocks to show 234 + 145:

Use squares for hundreds, lines for tens, and dots for ones

Answer: _______

8. Use the hundreds chart strategy to solve 356 - 129:

Steps:

Start at 356, jump back 100 to get _______

Jump back 20 to get _______

Jump back 9 to get _______

🧩 Part 4: Strategy Matching

9. Match each problem with the best strategy:
1. 567 + 298
2. 400 - 156
3. 234 + 125
4. 503 - 299
A. Column method (easy)
B. Add 300, subtract 2
C. Subtract 300, add 1
D. Jump back on number line

🏪 Part 5: Real-Life Problems

10. At the school fair, Class A raised $345 and Class B raised $278. How much did they raise altogether?

Answer: $ _______

11. The library had 642 books. They gave away 185 books to other schools. How many books are left?

Answer: _______ books

12. Explain which strategy you used for question 11 and why:

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