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Presentation transcript:

[Student Name] [Current Date] Estimating [Student Name] [Current Date]

Why Estimate? Get a quick answer – not exact Check results From your calculator From a report you are reading From a speaker making a claim

Leading Digit Estimates Keep Leading Digit Only 14,567 83,452 28,609 +34,715 10,000 80,000 20,000 30,000 140,000 Quick, but dirty… Keep the leading digit only Maintain place value Calculate

Better Estimates: Round Off Which digits matter? Round off: Up, if the next digit is 5 or more Down, if the next digit is 4 or less 80 81 82 83 84 85 86 87 88 89 80  Round down Round up  90