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Rules and exercises to estimate numbers to tens, hundreds, or thousands

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Rounding to Tens When estimating to tens look at the ones digit. If the digit is 5 or more, the rounding goes up. If the ones digit is 4 or less, the rounding goes down. 10, 11, 12, 13, and 14, all become 10 15,16, 17, 18, and 20, all become 20

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Now, try to estimate to tens on your own 23121 34234 45365 56829 67283 88507 91756

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These are the right answers. How many did you get right? 2320121120 3430234230 4550365370 5660829830 6770283280 8890507510 9190756760

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ESTIMATING TO HUNDREDS When estimating to hundreds, the tens digit determine if the estimate goes up or down. Like in the rounding to ten, if the tens digit is 5 or more, the estimate goes up. If the tens digit is 4 or less, the estimate goes down. 123, 135, 109, 149, all go down to 100 150, 161, 172, 183, 199, all go up to 200

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Now, you try to round to hundreds 102 134 145 187 298 980 875 808 1,4532,354 2,6543,765 7,3458,543 9,2309,999

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How many did you get right? 102100 134 100 145100 187 200 298300 9801,000 875900 808 800 1,4531,5002,354 2,300 2,6542,7003,765 3,800 7,3457,3008,543 8,500 9,2309,2009,999 10,000

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Estimating Thousands When estimating to thousands, the hundreds digit is the one that determines if the number goes up or down. If the hundreds digit is 5 or more the estimation goes up. If the hundreds digit is 4 or less, the estimation goes down. 1,209, 1389, 1451, and 1499 all become 1,000 2,500, 2,676, 2,765, and 2999 all become 2,000

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Now, try to estimate to thousands 1,59832,456 3,46347,678 4,87569,087 5,70978,234 7,08912,909 4,32387,109 6,67590,534

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How well did you do? 1,5982,00032,45632,000 3,4633,00047,67848,000 4,8755,00069,08769,000 5,7096,00078,23478,000 7,0897,00012,90913,000 4,3234,00087,10987,000 6,6757,00090,53491,000

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Estimate these numbers to tens, hundreds, and thousands 7, 461 8,071 9,087 4,690

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Did you get them right? 7, 461 7,4607, 5007,000 8,071 8,0708,1008,000 9,087 9,0909,1009,000 4,690 4,6904,7005,000

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