You can check by using your estimated number and comparing it with your exact quotient.
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Estimate the answer. If the calculated answer is close to the estimate then it is reasonable.
12 centimetres is a reasonable estimate.
To use multiplication to check the quotient, you multiply the quotient by the divisor given! For instance: 6 / 2 = 3 Then, to check that 3 is the quotient of 6 and 2, multiply 3 by 2 to get 3 x 2 = 6.
24 is a reasonable estimate. (78% of 31 is 24.18).
81.5