Today we worked on making product estimates by rounding to the biggest place (so that there was only one non-zero digit) and then multiplying the two non-zero numbers and placing all of the zeros behind that product. For example, if the factors were 27*43, you would round 27 to 30 and 43 to 40. Then multiply 3 by 4 to get 12 and place two zeros (one from 30 and one from 40) behind the 12 to get an estimate of 1,200.
We also talked a bit about estimating quotients (division) using compatible numbers which we will do later in this unit. The remaining time in class was given to practicing multi-digit (2 or more) multiplication using the online math book game "Top It". Students could choose from two challenge levels. All problems must include the rounded factors on their homework- see example below: Estimate the product of 27 and 43: Answer (required format) 30 * 40 = 1,200 HOMEWORK TONIGHT: ESTIMATING PRODUCTS SIDE IS REQUIRED, ESTIMATING QUOTIENTS IS A CHALLENGE AND NOT REQUIRED
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