Practice Adding Three or More Decimals

Instructor: Jessica Lowe
This lesson gives a short and easy way to add 3 or more decimals. It explains step by step how to set up a decimal addition problem and how to do the problem. It also explains some new words that you should know when adding decimals.

What Is a Decimal?

Do you like to go to the store and buy yummy treats? You may want to know how to add decimals before you go! In this lesson, you'll get to learn all about adding 3 or more decimals.

Before we can add decimals, you have to know what a decimal is right? A decimal is any number that has a point with numbers to the right of the point. The numbers to the right of the point or decimal are equal to less than 1. You may also want to know what sum means. The sum is the answer to an addition problem.

Steps To Add 3 or More Decimals

Let's get started by looking at an example problem. You are at the grocery store and want to buy a chocolate bar for $1.25, a bag of chips for $2.50, and some strawberries for $4.23. You want to make sure you have enough money, so you need to add the three decimal numbers together: $1.25 + $2.50 + $4.23.

1. Stack each decimal on top of each other in the right place value spot.

2. Write the three decimal points stacked on top of each other first, then fill in the numbers to the appropriate place.

3. Draw a line underneath of the bottom decimal number then draw your addition sign to the far left of the line. Before you start adding, drop your decimal point right below the others into the answer row. This will make sure you don't forget to put it in the final sum.

4. Starting all the way in the hundredths place (the farthest digit to the right-it may not always be the hundredths place), you will add the 5 in $1.25, the 0 in $2.50, and the 3 in $4.23. You will get a sum of 8 so write this under the line of this column.

5. Move one column to the left, which is the tenths place, and add those numbers. The numbers you would add are 2 in $1.25, the 5 in $2.50, and the 2 in $4.23. The sum of this column is 9 so write this under the line of this column.

6. Add the ones column. Add the 1 in $1.25, the 2 in $2.50, and the 4 in $4.23. The sum of this column is 7.

Your final sum for this addition problem and your total at the grocery store would be $7.98.


Example 1


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