Missing Addends Worksheets Within 20
Find missing addends in either position with free worksheets within 20. Choose a question count and download a printable sheet with answers.
Make your worksheet
Missing Addends Worksheets Within 20
Write the missing number. Check by adding both parts.
Name: ____________________ Date: __________
- 1.
___ + 3 = 4
- 2.
12 + ___ = 20
- 3.
___ + 10 = 20
- 4.
18 + ___ = 18
- 5.
___ + 2 = 18
- 6.
4 + ___ = 11
- 7.
11 + ___ = 18
- 8.
7 + ___ = 10
- 9.
13 + ___ = 19
- 10.
___ + 9 = 18
- 11.
11 + ___ = 16
- 12.
___ + 1 = 6
Print at actual size or 100%. Answer keys start on a new page. Changing the set changes the order and selection; familiar facts may appear again.
A worked example
___ + 7 = 12
Answer: 5
Count from 7 up to 12, or subtract 7 from 12. Check: 5 + 7 = 12.
How to use these worksheets
The blank may be the first or second addend. The total is given, so the task is to find a part rather than another total. Start with counters covering one part, then connect the model to subtraction.
Watch for this
If a learner adds the two visible numbers, point to the total after the equals sign. Ask which number joins 7 to make 12.
Choose the next skill
Use easier facts for a warm-up, or connect this skill to another kind of question.
Addition Within 10 Worksheets
Add the two numbers. Write the total in the blank.
Missing Numbers in Subtraction Worksheets
Find the missing number, then check the complete subtraction equation.
Addition and Subtraction Fact Family Worksheets
Use the three numbers to write two addition and two subtraction equations.
Printing and practice questions
Are the worksheets and answer keys free?
Yes. Generate and download these individual worksheets without an account. You can use them at home, in your classroom, or with your tutoring students.
Can I make a different worksheet next time?
Choose New questions for another set. Save settings remembers the question count, paper size, and answer-key choice on this device. It does not store learner names or progress.
Will this print on my paper size?
Select A4 or US Letter before downloading. Print the PDF at actual size. You can omit the answer key, or print only the question pages for learners.
What should I do if the questions are too difficult?
Start with six questions and work through the example together. Use the linked prerequisite skills or physical counters before trying another set. These are practice materials, not a diagnostic assessment.
Browse the original numbered worksheet sets
These existing worksheet links remain available.