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Decimals: Signed Decimal Addition and Subtraction

Compute:

[tex]\begin{array}{r}

39.4 + (-7.2) = \square \\

7.9 - 49.35 = \square

\end{array}[/tex]

Answer :

Let's solve each of the expressions step-by-step:

1. Expression 1: [tex]\( 39.4 + (-7.2) \)[/tex]

- Start with the number 39.4.
- Since we are adding a negative number, it is the same as subtracting the positive value from the original number.
- So, [tex]\( 39.4 + (-7.2) \)[/tex] becomes [tex]\( 39.4 - 7.2 \)[/tex].
- Perform the subtraction: [tex]\( 39.4 - 7.2 = 32.2 \)[/tex].

2. Expression 2: [tex]\( 7.9 - 49.35 \)[/tex]

- Start with the number 7.9.
- We need to subtract 49.35 from 7.9.
- Subtraction gives us [tex]\( 7.9 - 49.35 = -41.45 \)[/tex].

Therefore, the results for the expressions are:
- [tex]\( 39.4 + (-7.2) = 32.2 \)[/tex]
- [tex]\( 7.9 - 49.35 = -41.45 \)[/tex]

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