WorksheetsAddition and Subtraction to 20
Total questions: 10
Name
Class
Date
Answer KeyAddition and Subtraction to 20
Total questions: 10
1.
20
2.
13
3.
10
4.
8
5.
12
6.
17
7.
15
8.
19
9.
4 ducks, 4
10.
21 students, 21
Addition and Subtraction to 20
Created by Ciera Hurt
10 questions
1st Grade
Math
Updated Feb 2026
Addition and Subtraction to 20 is a Grade 1 mathematics worksheet with 10 fill-in-the-blank questions. Students solve single-step addition and subtraction problems, combine three addends, and use related addition and subtraction equations such as 9 + 6 = 15 and 15 - 9 = 6. The worksheet also applies these operations to short word problems about ducks leaving a pond and students joining a class, helping learners connect number sentences to real situations. This free printable worksheet is designed for early practice, independent work, homework, or a quick skills check. It gives teachers evidence of whether students can select the correct operation, calculate sums and differences within 20, and complete missing answers accurately. An answer key is included for efficient review and grading.
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FAQs
What does the Addition and Subtraction to 20 worksheet cover?
This Grade 1 worksheet uses 10 fill-in-the-blank items to practise addition and subtraction within 20. Students solve single-operation equations, add three numbers, complete related addition-and-subtraction equations, and apply the operations to two short word problems. These varied item types build fluency while checking whether students can choose an operation and record the missing number.
How can I use this worksheet to teach addition and subtraction within 20?
Introduce the worksheet by modelling one addition equation and one subtraction equation with counters or a number line, then ask students to explain what the symbols mean. Use the related-equation items to show how a completed addition fact can help solve the corresponding subtraction fact. Finish by having students underline action words in the duck and class word problems and explain why they chose subtraction or addition before filling in the answer.
What mistakes should I watch for when students complete this worksheet?
Watch for students reversing the operation in the word problems—for example, adding when 13 ducks swim away or subtracting when two students join the class. In the related-equation items, students may calculate 9 + 6 correctly but fail to use 15 as the missing number in 15 - 9 = 6, or may fill only one of the two blanks. Students may also skip one addend in the three-number sums, such as 5 + 4 + 3.
How do I assign and grade this worksheet?
This worksheet is available as a printable PDF and as a digital quiz on Wayground, with a complete answer key for all 10 fill-in-the-blank questions. For printed submissions, you can scan student work with the **Wayground for Teachers** app to help grade responses. The printable format also gives schools an option for practice with less screen time.
How can I differentiate this addition and subtraction worksheet for my students?
Use the worksheet’s Advanced Settings to adjust font spacing or increase the font size so the equations, paired related facts, and word-problem text are easier to read. You can also select a dyslexia-friendly font for students who benefit from that format, or translate the worksheet into another language to support comprehension of the duck and classroom word problems.
Where can I find more worksheets like this on Wayground?
Wayground offers a broad collection of free printable worksheets and practice problems across subjects, with downloadable PDFs and answer keys to support essential skills and concepts. Teachers can browse more resources at https://wayground.com/en-us/worksheets.