### Error Checking

**Error
Checking **works like Spell Checking. Errors can be marked and
corrected one at a time, or Live, as you work on your formulas.

**Before
You Begin: Make a Mistake**

Select Cell
E8.

Enter this
formula: =C7*D8.

**What Do
You See?** This formula does NOT match the formula above or below
it. So, Cell E8 has a error mark, a small triangle in the upper left
corner.

Keep
going, please...