Basic Math Examples

3 - - 1

$3 - - 1$

Step 1

Replace all occurrences of

-

$-$

-

$-$ with a single

+

$+$ . Two consecutive minus signs have the same mathematical meaning as a single plus sign because

- 1 \cdot - 1 = 1

$- 1 \cdot - 1 = 1$

3 + 1

$3 + 1$

Step 2

Add

3

$3$ and

1

$1$ .

4

$4$