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

(−0.21)+(−0.79)= (-0.21)+(-0.79)=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
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

Step-by-step written solution

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1

Understand the problem

(−0.21)+(−0.79)= (-0.21)+(-0.79)=

2

Step-by-step solution

Using the following rule:

+(−x)=−x +(-x)=-x

Let's rewrite the exercise as seen below:

−0.21−0.79= -0.21-0.79=

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

Therefore:

−0.21−0.79−1.00 -0.21\\-0.79\\-1 .00

3

Final Answer

−1 -1

Practice Quiz

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a is negative number.

b is negative number.

What is the sum of a+b?

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