Adding three numbers is a big step for first graders, and it builds directly on the addition facts they already know. In Grade 1, students learn to add three whole numbers whose sum is within 20, a skill called out in Common Core standard 1.OA.2. Instead of always adding left to right, kids learn to look at all three numbers and choose a smart order. The three strategies in this worksheet pack are make ten, count on, and look for doubles. Making ten means spotting two numbers that add to 10, like 2 and 8, and adding those first so the last step is easy. Looking for doubles means finding matching numbers such as 3 and 3 or 5 and 5 because doubles facts are quick to recall. Counting on works well when one number is much larger than the others. Practicing these flexible strategies helps first graders build number sense, work faster, and feel more confident with bigger sums as they move toward Grade 2 addition.
Worksheet Preview
Browse all 12 printable worksheets below — click any card to open the full page.
Adding Three Numbers
Adding Three Numbers
Adding Three Numbers
Adding Three Numbers
Adding Three Numbers
Adding Three Numbers
Adding Three Numbers
Adding Three Numbers
Adding Three Numbers
Adding Three Numbers
Adding Three Numbers
Adding Three Numbers
What's Included in This Download
What You'll Learn
These adding three numbers worksheets help grade 1 students develop essential math skills through engaging activities.
Learning Objectives
- Adding Three Numbers: Add three whole numbers whose sum is within 20
- Adding Three Numbers: Apply the make-ten strategy to three-addend problems
- Adding Three Numbers: Use doubles and counting-on strategies with three numbers
- Adding Three Numbers: Recognize the commutative and associative properties informally
Skills Covered
How to Use These Worksheets
- Download & Print: Click the download button to get the PDF. Print on standard 8.5" x 11" paper.
- Start Simple: Begin with easier pages before moving to more challenging activities.
- Daily Practice: Dedicate 10-15 minutes each day for consistent learning.
- Use Manipulatives: Pair worksheets with physical objects like blocks or counters.
- Provide Encouragement: Celebrate progress and effort to build confidence.
- Check Progress: Use the included answer key to review work together.
Common Mistakes to Watch For
- Always adding left to right and missing an easier pair that makes 10.
- Forgetting to add the third number after finding the first sum, like stopping at 2+8=10.
- Mixing up doubles facts, such as saying 4+4=9 or 6+6=11 instead of the correct sum.
Frequently Asked Questions
What does 1.OA.2 mean?
It is a Common Core standard asking first graders to add three whole numbers whose total is 20 or less using strategies like make ten, count on, and doubles.
Why is the make-ten strategy useful?
Ten is an easy number to add to, so finding two addends that make 10 first turns a tricky three-number problem into a quick one-step problem.
Can my child add the numbers in any order?
Yes. Addition is commutative and associative, so first graders can rearrange three addends to make the problem easier without changing the sum.
What are doubles facts?
Doubles are sums where both addends are the same number, like 3+3, 4+4, or 6+6. They are fast to recall and helpful inside three-number problems.
How can I practice at home?
Use small objects like beans or cereal. Ask your child to group them into a ten first, then count on, and talk about the strategy they chose.
Are these worksheets really free?
Yes! All our worksheets are 100% free to download and print. There's no subscription, no hidden fees, and no registration required.
Can I use these in my classroom?
Absolutely! Teachers are welcome to print and use these worksheets in their classrooms. Make as many copies as needed for your students.