Algebra Examples

$81 - 11.7$

Step 1

Round $81$ to $80$ .

$80 - 11.7$

Step 2

Round $- 11.7$ to $- 10$ .

$80 - 10$

Step 3

Subtract $10$ from $80$ .

$70$

Step 4

The approximate value of $81 - 11.7$ found by front end estimation.

$81 - 11.7 \approx 70$