Estimation in Subtraction
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Estimation in Subtraction
🎯 Part 1: Rounding to the Nearest 10
Remember: To estimate in subtraction, round both numbers to the nearest 10, then subtract!
a) 47 rounds to ______
b) 83 rounds to ______
c) 156 rounds to ______
d) 234 rounds to ______
a) 47 - 23 ≈ ______ - ______ = ______
b) 83 - 56 ≈ ______ - ______ = ______
c) 156 - 89 ≈ ______ - ______ = ______
💰 Part 2: Money Problems
Round $78 to the nearest $10: ______
Round $34 to the nearest $10: ______
Estimated answer: ______ - ______ = ______
🎲 Part 3: Choose the Best Estimate
🏃 Part 4: Rounding to the Nearest 100
For larger numbers, we can round to the nearest 100!
a) 567 - 234
567 rounds to ______, 234 rounds to ______
Estimate: ______ - ______ = ______
b) 823 - 456
823 rounds to ______, 456 rounds to ______
Estimate: ______ - ______ = ______
🧠 Part 5: Challenge Questions
Choose the TWO best estimation methods:
My estimate is: ____________ books
I chose to round to the nearest _______ because ________________________________
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