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Add money amounts

Adding money amounts means composing quantities in dollars and cents by aligning corresponding place values—dollars, tenths of a dollar, and hundredths of a dollar—and combining them, including regrouping 100 cents as 1 dollar. The learner connects decimal notation, such as $3.45, with cents and equations and interprets the sum as a total monetary amount; the scope is amounts expressed to the hundredths place, not arbitrary decimals or advanced financial calculations.

Detailed Explanation: Add money amounts

Line up the amounts by their decimal points. This matches dollars with dollars, tenths with tenths, and hundredths with hundredths.

Example: Add 2.75+$1.68$.

Write the numbers one below the other:

$2.75+ $1.68\begin{array}{r} \$2.75\\ +\ \$1.68\\ \hline \end{array}

  1. Add the cents: 75+68=14375+68=143 cents.
    Since 100100 cents equals 1,write, write 43inthecentsplacesandregroupin the cents places and regroup$1$ to the dollars column.

  2. Add the dollars, including the regrouped dollar:
    2+1+1=42+1+1=4.

  3. The total is:

$2.75+ $1.68$4.43\begin{array}{r} \$2.75\\ +\ \$1.68\\ \hline \$4.43 \end{array}

So, 2.75+$1.68=\boxed{$4.43}$.

Learn by doing: Add money amounts

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