# How do you compute 50-82?

Nov 4, 2016

$- 32$

#### Explanation:

use the relationship

$a - b = - \left(b - a\right)$

$50 - 82 = - \left(82 - 50\right)$

$= - 32$

In other words if the first number $>$ the second number .

Subtract the other way round and put a $-$ in front of the answer.

Nov 5, 2016

Just for fun this is another approach

$- 32$

#### Explanation:

50 is another way of writing $82 - 32$

So instead of writing 50 write $82 - 32$ giving

color(blue)(color(magenta)(50) -82" "->" "color(magenta)(cancel(82)-32)-cancel(82))" "=-32