Estimate: $64-23$

Given :

The given expression is $64 - 23$.

To do :

We have to estimate the given expression.

Solution :

Round and Estimating Subtraction Problems in Tens:

• Round the numbers that will be subtracted to the nearest ten: if the number ends in 0, 1, 2, 3, or 4, we round down. If the number ends in 5, 6, 7, 8, or 9, we round up.
• Subtract the rounded numbers.

Therefore,

64 is rounded to 60.   (Since 4 is less than 5)

23 is rounded to 20.   (Since 3 is less than 3)

$60-20 = 40$.

The estimation of $64-23$ is 40.

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Updated on: 10-Oct-2022

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