Question

Perform the indicated operation. (pp. 750–752)

$3.8+7.1$

Short answer

$3.8+7.1=10.9$

Step-by-step solution

Step-1 – Define Decimal numbers: 

Decimal numbers are a set of numbers written together with a dit in between then that is called a decimal point.

Example: 56.78, 23.4, 29.008.

Step-2 – How to add or subtract the decimal numbers: 

To add two decimal numbers, first check if they have the same number of digits to the right of the decimal point. If they don`t add zeros to the right of one of the numbers until they do. Then, write one number on top of the other, lining up the decimal points vertically.

Step-3 –Evaluate: 3.8 + 7.1 

Addition the decimal numbers, both the decimal numbers are having 1 digit after the decimal point.

$\begin{array}{l}3.8\\ +\underset{¯}{7.1}\\ 10.9\end{array}$

$3.8+7.1=10.9$