Pre-Algebra Examples

$23 - 8$

Step 1

Round $23$ to $20$ .

$20 - 8$

Step 2

Subtract $8$ from $20$ .

$12$

Step 3

The approximate value of $23 - 8$ found by front end estimation.

$23 - 8 \approx 12$

$[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]$