Solve: Adding Negative Decimals (-0.21) + (-0.79)

Question

$(-0.21)+(-0.79)=$

00:00 Solution

00:03 Let's take the point (-0.21) on the axis

00:06 Positive times negative is always negative

00:09 Therefore subtract, move to the left (negative)* on the axis

00:16 And this is the solution to the question

Using the following rule:

$+(-x)=-x$

Let's rewrite the exercise as seen below:

$-0.21-0.79=$

Since we are subtracting from a negative number, the result will be negative.

Therefore:

$-0.21\\-0.79\\-1 .00$

$-1$