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Addition Worksheets

29 free PDFsUS Letter or A4Answer key includedNo login

Addition facts to 10 and 20 for 1st grade, with counting on, doubles, near doubles, make 10 and adding three numbers. Every page has an answer key.

Download the addition worksheets

Addition facts to 10

Add within 10 in rows and in vertical form, count on from the bigger number, and hop forward on a number line.

Addition facts to 20

Sums from 11 to 20 in rows and stacked, plus adding to a teen number (13 + 4) where only the ones change.

Doubles and near doubles

Doubles with ten frame pictures, doubles facts for adding and subtracting, and near doubles solved as a double and 1 more.

Make 10

Find the number that makes 10, then use it: fill the first ten frame and add the rest.

Add three numbers

Add three numbers by finding a pair that makes 10 or a double first, and see that adding in either order gives the same sum.

Fluency checks

Thirty facts within 10 with a score box, for quick weekly checks.

Print at 100% (actual size) for the cleanest tracing lines.

About these addition worksheets

These addition worksheets cover the first grade year: adding within 10 until the facts are quick, then adding within 20 with the strategies that make the bigger facts easy. Each skill has its own page, so you can practice exactly what your child or class needs next.

Facts to 10 come in rows and in vertical (stacked) form, plus counting on and number line pages for children who still count to add. For facts to 20 there are doubles, near doubles (6 + 7 is 6 + 6 and 1 more), make 10 pages with two ten frames, and adding three numbers by finding a pair that makes 10.

Most pages come as Sheet A, B and C with the same skill and different problems, so you can practice on Monday and check again on Friday. Every page has an answer key on page 2, and prints in black and white on US Letter or A4.

Standards

  • CCSS.MATH.CONTENT.1.OA.B.3Apply properties of operations as strategies to add and subtract. Examples: If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known. (Commutative property of addition.) To add 2 + 6 + 4, the second two numbers can be added to make a ten, so 2 + 6 + 4 = 2 + 10 = 12. (Associative property of addition.)
  • CCSS.MATH.CONTENT.1.OA.C.5Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).
  • CCSS.MATH.CONTENT.1.OA.C.6Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 - 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).

How to use them

  1. Start with Add Within 10. If your child counts every fact on fingers, spend time on the Count On to Add and number line pages before moving on.
  2. Teach one strategy at a time: doubles first, then near doubles, then make 10. Each strategy page shows the steps so children can see why the answer is right.
  3. Use the fluency checks every week or two. Time one minute, or just count how many are right, and let your child try to beat their own score.
  4. Move to Add Within 20 once facts to 10 are quick. Keep a ten frame or a 0 to 20 number path on the table while children learn the strategies.
  5. Use Sheet B or C a few days later to see if the skill has stuck.

Teaching tips

  • Counting on: put the bigger number in your head, then count up. For 2 + 9, start at 9 and say 10, 11.
  • Make 10: 8 + 5 is the same as 8 + 2 + 3. Fill the ten first, then add what is left: 10 + 3 = 13.
  • Near doubles: if your child knows 6 + 6 = 12, then 6 + 7 is just 1 more.
  • Turnaround facts halve the work: once a child knows 3 + 8, they also know 8 + 3.
  • For three numbers, look for two that make 10 and add them first. 7 + 4 + 3 becomes 10 + 4.
  • If a page feels hard, cover half of it. A few problems done well beat a full page of guessing.

Questions teachers and parents ask

What addition should a 1st grader know?

By the end of 1st grade, children add within 20 using strategies like counting on, making 10 and doubles, and they know their addition facts within 10 quickly from memory.

What is the make 10 strategy?

To add 8 + 5, move 2 from the 5 to make the 8 a ten: 8 + 2 = 10, then 10 + 3 = 13. The make 10 pages show this with two ten frames, so children can see the dots move.

Why are there Sheet A, B and C versions?

Each version practices the same skill with different problems. Use one to practice, then another a few days later to see if the skill has stuck.

Are there answer keys?

Yes. Every page has an answer key on page 2 of the PDF. The number line keys show every hop, and the make 10 keys show which dots moved.

How do I use the fluency checks?

Give your child the page and time one minute, or let them finish and count how many are right. Write the score at the top, and try Sheet B a week later to see the progress.