Question

rewrite each problem vertically, and so
a. 1.42 + 2.157 = ______

Explanation:

Step1: Rewrite vertically

Align the decimal points:

$$\begin{align*} &1.420\\ +&2.157\\ \hline \end{align*}$$

(We add a zero to 1.42 to make the number of decimal places equal for easier addition.)

Step2: Add column by column

Start from the rightmost column (thousandths place):

• Thousandths place: \(0 + 7 = 7\)
• Hundredths place: \(2 + 5 = 7\)
• Tenths place: \(4 + 1 = 5\)
• Ones place: \(1 + 2 = 3\)

So the addition is:

$$\begin{align*} &1.420\\ +&2.157\\ \hline &3.577\\ \end{align*}$$

Answer:

\(3.577\)