Estimating Quotients Using Rounding

When the problem does not require an exact answer, we use estimation

To estimate the quotient, round the dividend to the highest place. For example, to estimate 76 ÷ 4, round 76 to its highest place (tens)

Use basic division facts and division patterns to find the quotient

When the problem does not require an exact answer, we use estimation

To estimate a quotient, we find compatible numbers. Quotient is the answer to a division problem

To estimate the quotient of 348 ÷ 9, use division facts to find a compatible number so that we can solve the problem mentally

270 and 9 are compatible numbers because they are easy to divide mentally. Similarly, 360 and 9 are compatible numbers

270 ÷ 9 = 30 and 360 ÷ 9 = 40. 348 is closer to 360 than 270. So, the better estimate of 348 ÷ 9 is 40