Find the sums of three integers. The topic focuses on slightly larger integers.

Having the ability to find add three different numbers together always seems foreign to students at first. This is because we often teach all four operations while working with on two numbers. You can approach this several ways with your students, most teachers use a two-step method where they have students break it into parts. As you scroll down the page, you will notice how diverse the problem sets are between each worksheet. You will find simple single-digit three-integer sums. While this seems an easy go to, it is a great starting place. This way place values really aren't a nuisance; you can focus adding the individual integers. You will also find a series of rapid fire worksheets and you can use as timed math worksheet. As I'm writing this description, I continue to scroll down the page. Still scrolling... Still scrolling… Yeah, there are boatload of worksheets to choose from on this page. If you scroll all the way down (down, down, down) you will see that we have visual sum worksheets available. This is a great starter for kids that are totally new to the concept.

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Print Adding Three Numbers Worksheets

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The Lesson


Add the ones column place. 4 + 1 + 5 = 10. 2. Rename 10 as 1 + 0 (the 1 is placed over the tens column). 3. Add the tens column place. 6 + 3 + 1 + 1 = 11. 4. Rename 11 as 1 and 1(the 1 is placed over the hundreds column). 5. Add the hundreds column place. 5 + 2 + 2 + 1 = 10. 6. Bring down 1 from the hundreds column. The answer is 1,010.

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Introduction Worksheet

Try the Skill

Add the ones column place. 4 + 0 + 8 = 12. Rename 12 as 1 + 2 (the 1 is placed over the tens column). Add the tens column place. 2 + 3 + 6 + 1 = 12. Rename 12 as 1 and 2(the 1 is placed over the hundreds column). Add the hundreds column place. 7 + 7 + 1 = 15. Bring down the 1 from the hundreds column. The answer is 1,722.

Worksheet 1

Adding Three Numbers - Worksheet 1

Solve the following the ten problems that are presented. There is plenty of space provided so if you would like reposition the addends, feel free to do so.

Worksheet 2

Adding Three Numbers - Worksheet 2

Solve the following problems together in full. Each of the addends may be composed of a different number of digits.

Worksheet 3

Worksheet 3

Push the three numbers all together and sum it all up. remember to zero out columns that are missing a digit.

Rapid Fire Worksheet

Rapid Fire

Twenty-five boxed sum problems for you to take for real. You can time this, if you would like.

Single-Digit Lesson

Introduction Lesson

Add the first number to the second number i.e. 4 + 1 = 5. Add the resultant to the third number i.e. 5 + 3 = 8.

Try the Skill Worksheet

Try the Skill

Add the ones column place. 7 + 4 + 6 = 17. Rename 17 as 1 and 7 (the 1 is placed over the tens column). Bring down the 1 from the tens column. The answer is 17.

Practice Worksheet


Adding those single digits all together. This can help you review or introduce this skill to students.

Single-Digit Worksheet 1

Worksheet 1

A nice solid look at this topic and set it all up.

Single-Digit Worksheet 2

Worksheet 2

Mix out all the problems you can get a hold of. Just a couple of problems to work with here.

Single-Digit Worksheet 3

Worksheet 3

This is a much larger offering of problems. A matrix of twenty-five problems.

Do Now Worksheet

Do Now

Well set out problems for you to put together sums. We use a thicker font, than we have in the past.

Meet the Skill Worksheet

Meet the Skill

1. Add the ones column place. 6 + 6 + 3 = 15. 2. Rename 15 as 1 + 5 (the 1 is placed over the tens column). 3. Add the tens column place. 5 + 5 + 2 + 1 = 13. 4. Rename 13 as 1 and 3(the 1 is placed over the hundreds column). 5. Add the hundreds column place. 2 + 1 + 1 + 1 = 5. The answer is 535.

Try the Skill Worksheet

Try the Skill

Add the ones column place. 2 + 6 + 8 = 16. Rename 16 as 1 + 6 (the 1 is placed over the tens column). Add the tens column place. 3 + 3 + 6 + 1 = 13. Rename 13 as 1 and 3(the 1 is placed over the hundreds column). Add the hundreds column place. 4 + 2 + 3 + 1 = 10. Bring down the 1 from the hundreds column. The answer is 1,036.

Practice the Skill Worksheet

Practice the Skill

Get the three integers sums all together. This gives you plenty of room to add the three numbers together.

Skill Again Worksheet

Practice the Skill Again

We increase the number of digits that we use in the three numbers. Adding three-digit numbers to get you there.

Skill Again Worksheet

Show the Skill

They put together 3 addends of 3-digit numbers in the addition to the others on the dock.

Showoff Worksheet


Let's see how all this goes down for you. This is a great way to assess where you are with this skill.

Warm-up Worksheet


We now jump up in the size of the addends and have some that have 5-digits. Put all the numbers together in these nicely put together problems.

Three Number Column Lesson

Three Number Column Addition Lesson

Put all the numbers together. We work you through how to use this column strategy when solving these types of problems.

Column Addition Worksheet

Column Addition Worksheet 1

Why not throw an extra addition symbol in there for fun.

Column Worksheet 2

Number Column Addition #2

Don't you love that extra symbol for yourself? This worksheet will help you lean into this skill a bit more.

Review Worksheet


We show you how to: Add the first number to the second number- 7 + 5 = 12. Add the resultant to the 4. Write the answer i.e. 17 third number .

Single-Digits Quiz

Single-Digits Quiz

Let's see how solid you are on this one? This one should be very easy for you to handle.

Do Now

Do Now

Why not put it all in one basket and do this as a class.

Visual Sums Worksheet

Visual Sums of Three Numbers

Determine the total of each group. A worked through problem.

Visual Sums Worksheet 2

Round #2

We add the extra problems for you. This can be very helpful.

Visual Sum Practice Worksheet

Visual Sums of Three Numbers

An example problem on this worksheet is: 41 books are on shelf a. 58 books are on shelf b. 10 books are on shelf c. How many books are there altogether?

Practice the Skill Twice Worksheet

Practice the Skill Twice

Example problem: 12 men are in car a. 6 men are in car b. 10 men are in car c. How many men are there altogether? 10 people are in train a. 19 people are in train b. 5 people are in train c. How many people are there altogether?

Show the Skill Worksheet

Show the Skill

Determine the total of each group. Use all the skills that we have reviewed on this page.

Visual Warm Up Worksheet

Warm Up

59 crayons are in box a. 26 crayons are in box b. 39 crayons are in box c. How many crayons are there altogether?

What is the Best Way to Add 3 Numbers?

In mathematics, you will need to add more than one number at the same time. These numbers will have multiple digits.

Add 3 numbers may look hard to beginners, but it is a wonderful first-grade math concept that, once achieved, will make your students feel extremely proud of themselves.

To understand whether your answer is correct, you need to pay particular attention to value, drawing columns, and lining up the numbers.

Using Different Colors

You can host a group activity to teach students how to add three numbers. All you need is a container where you can put counting cubes of three colors. Allow the students to reach into the container and grab as many cubes as that fit into their hands. These cubes then need to be sorted by color.

Once done, get a ten frames mat and put the cubes on it without leaving any gaps between the colors so that you can see what numbers are formed. The students then need to note the number sentence they have made and write it down on their recording sheet.

By counting different colored cubes and ten frames, they will start to understand the concept and then understand why 3 + 4 + 5 = 12. Children need to know what they are doing when they add three amounts together so that they can solve any problem in the future. This is a great activity to introduce students to adding 3 numbers so that they do not get confused when you begin adding numbers.

Drawing Up the Columns

When you know each number's value, you must start lining up the bigger numbers correctly. To make this easier for you, we would recommend that you draw four columns on a piece of paper. Start from right to left and label every column by putting the value underneath it.

Use the numbers in your mathematical equation so that they are lined up according to tens, hundreds, and thousands if needed. Once your numbers have been drawn up correctly, you can start adding them.

Paying Attention to the Order of the Numbers

When adding three numbers, you do not need to pay particular attention to the order in which the three numbers need to be added. A great strategy to add three numbers is to start with the smaller numbers first.

Take a look at the equation below.

2 + 3 + 5

If your equation looks like this, you need to restructure it so that it looks like this:

5 + 5.

This is done by adding the smaller numbers (2 and 3) so that you can then add their sum with the bigger number. When adding 5 with 5, you might also find that it is a number bond to ten.

A common strategy to add three single-digit numbers is by creating number bonds to ten to make your work simpler. For example, if your equation is 9 + 8 + 2, you can replace 8 and 2 with bonds of 10. This means adding them so that you are left with the number 10. Then, you can add 10 to 9, making your total sum 19. It is easier to add single-digit numbers because the final number ends in the same digit.