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3-Digit Addition Subtraction

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3-Digit Addition Subtraction

3-Digit Addition and Subtraction

Base-10 blocks showing hundreds, tens and units

🔢 Part 1: Addition Problems

1. Solve these addition problems. Show your working in the box below each problem.

a) 234 + 156 = _______

b) 467 + 285 = _______

c) 329 + 194 = _______

2. Estimate first, then calculate the exact answer:

a) 378 + 245

My estimate: _______ (round to nearest hundred)

Exact answer: _______

➖ Part 2: Subtraction Problems

3. Solve these subtraction problems. Remember to regroup when needed!

a) 456 - 178 = _______

b) 634 - 287 = _______

c) 502 - 149 = _______

4. Check your answer by using the inverse operation:

Problem: 725 - 368 = _______

Check: _______ + 368 = 725

🧠 Part 3: Word Problems

5. Read each problem carefully and solve. Show your working.

a) Sarah has 456 marbles. She gives 123 marbles to her friend Tom. How many marbles does Sarah have left?

Answer: _______ marbles

b) A school collected $345 on Monday and $278 on Tuesday for their fundraiser. How much money did they collect altogether?

Answer: $_______

c) There were 634 people at the rugby match. During half-time, 187 people left. How many people stayed to watch the rest of the match?

Answer: _______ people

🎯 Part 4: Place Value Challenge

6. Fill in the missing numbers:

a) 2__ 5 + 1 3 __ = 4 8 8

b) 6 __ 7 - 2 4 9 = 3 5 8

c) __ 4 2 + 1 8 __ = 6 2 5

7. Circle the problems that will need regrouping:

234 + 145

567 + 286

421 - 308

635 - 124

789 + 156

✏️ Part 5: Explain Your Thinking

8. Explain how you would solve 456 + 287 using place value. Use words like "hundreds," "tens," and "units" in your explanation.
9. Why is it important to estimate your answer before calculating? Give one reason.
10. Draw base-10 blocks to show the number 347:

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