Adding & Subtracting Decimals Practice

Adding Decimals:

1. Write the numbers vertically and line up the decimal points
   • Extra zeros may be written to the right of the decimal point after the final non-zero digit if desired
2. Draw a plus sign "+" to the left of the bottom number and a line underneath
3. Bring the decimal point straight down into the answer
4. Add starting in the rightmost column and work left
   • Use carrying when the result of the addition from a column is larger than 9

Subtracting Decimals:

1. Write the numbers vertically and line up the decimal points
   • Extra zeros may be written to the right of the decimal point after the final non-zero digit if desired
   • We will need to add in zeros in some cases (top number (minuend) has fewer digits after the decimal point than the bottom number (subtrahend)) for borrowing
2. Draw a minus sign "-" to the left of the bottom number and a line underneath
3. Bring the decimal point straight down into the answer
4. Subtract starting in the rightmost column and work left
   • Use borrowing when the bottom number of a column is larger than the top number

Step-by-Step: