Place Value Error Checking
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Place Value Error Checking
🎯 WALT: We Are Learning To use place value to check for errors in calculations
Success Criteria:
✓ I can identify place value errors in addition and subtraction
✓ I can use estimation to check if answers are reasonable
✓ I can explain why an answer might be wrong
Part 1: Spot the Errors
Show your working to check:
Explain your thinking:
My estimate: 800 - 300 = _______
Is Maya's answer close to your estimate?
Yes NoPart 2: Estimation Strategies
467 rounds to: _______
298 rounds to: _______
Estimated answer: _______
Now calculate the exact answer and check if it's reasonable:
Round 756 to: _______
Round 289 to: _______
Estimated answer: _______
Is Jake's answer reasonable? Explain:
Explain your estimation strategy:
Part 3: Error Detective
a) 234 + 178 = 312
b) 605 - 248 = 457
Use estimation first: _______ + _______ = about _______
Now check exactly:
The manager's answer is:
Correct IncorrectMy problem: _______ + _______ = _______
Check using estimation:
Check using exact calculation:
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