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Round your factors to the nearest 10's, 100's 1000's, etc. Then multiply. You should be able solve the problem more or less in you head. If you need to use a pen and paper, you must round to and even higher place. When rounding, if the place your rounding ends in 1-4, you round down. 5-9= round up. For example: 14 rounded to the nearest 10 =10. 16 rounded to the nearest 10=20. 123 rounded to the nearest 100= 100. 191 rounded to the nearest hundred= 200.

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Q: How to Estimating product of whole numbers and decimals?
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