Addition within 20 worksheet (free printable PDF with answers)
Adding within 20 is a big step in Class 1 and Class 2 maths. The hard sums are the ones that cross 10, such as 8 + 5 or 7 + 6.
This worksheet starts with six easy sums within 10, then moves to sums that cross 10. Page 2 is an answer key for you, so your child can check their own work.
Download the free PDF · Practise addition online
Addition Within 20: Worksheet with a make-ten trick and an answer key
Make 10 first
9 + 6: give 1 from the 6 to the 9 to make 10.
10 + 5 = 15, so 9 + 6 = 15.
Add. Write the answer.
- 3 + 4 = ______
- 5 + 2 = ______
- 6 + 3 = ______
- 4 + 4 = ______
- 7 + 2 = ______
- 2 + 8 = ______
- 8 + 5 = ______
- 9 + 4 = ______
- 7 + 6 = ______
- 6 + 5 = ______
- 9 + 7 = ______
- 8 + 8 = ______
- 4 + 9 = ______
- 5 + 7 = ______
- 9 + 3 = ______
- 6 + 8 = ______
- 7 + 7 = ______
- 8 + 4 = ______
- 9 + 9 = ______
- 5 + 6 = ______
- 3 + 8 = ______
- 7 + 5 = ______
- 6 + 9 = ______
- 8 + 7 = ______
Answer key (for grown-ups)
Fold or cover this page while your child works, then check together.
Talk about any mistake: "How did you work it out?"
| Sum | Answer | Sum | Answer | Sum | Answer |
|---|---|---|---|---|---|
| 3 + 4 | 7 | 5 + 2 | 7 | 6 + 3 | 9 |
| 4 + 4 | 8 | 7 + 2 | 9 | 2 + 8 | 10 |
| 8 + 5 | 13 | 9 + 4 | 13 | 7 + 6 | 13 |
| 6 + 5 | 11 | 9 + 7 | 16 | 8 + 8 | 16 |
| 4 + 9 | 13 | 5 + 7 | 12 | 9 + 3 | 12 |
| 6 + 8 | 14 | 7 + 7 | 14 | 8 + 4 | 12 |
| 9 + 9 | 18 | 5 + 6 | 11 | 3 + 8 | 11 |
| 7 + 5 | 12 | 6 + 9 | 15 | 8 + 7 | 15 |
How to use this worksheet
- Do six sums a day rather than all 24 at once.
- Let your child use fingers, beads or a number line at first. Speed comes later.
- For sums that cross 10, use the make-ten trick from the box at the top.
- Check together with the answer key and talk about any mistake: "How did you get that?"
The make-ten trick
To add 8 + 5, split the 5 into 2 and 3. 8 + 2 makes 10, and 10 + 3 is 13. Children who know the pairs that make 10 (1 + 9, 2 + 8, 3 + 7, 4 + 6, 5 + 5) find this quick.
Practice
- 9 + 4 = ?
Show answer
13 (9 + 1 = 10, then 10 + 3 = 13) - 7 + 6 = ?
Show answer
13 - Which number makes 10 with 6?
Show answer
4 - 8 + 8 = ?
Show answer
16
Lessons on MangoMindz
- Class 1 Maths: Adding and Taking Away up to 20: Free picture lessons and a quiz
- Class 1 Maths: Adding within 10: Free picture lessons and a quiz
- Class 2 Maths: Addition up to 99: Free picture lessons and a quiz
More printable charts
- Subtraction Within 20: 24 take-away sums with a back-to-10 trick and an answer key.
- Number Names 1–100: Every number from 1 to 100 in English and Hindi, with अंक.
- Table of 2: 2 × 1 to 2 × 12, a quick trick and practice.
- All free printable charts: Tables 1–20, number names, Hindi and English charts
Frequently asked questions
Which class is this addition worksheet for?
Class 1 (ages 6–7) and Class 2 (ages 7–8). It suits any child who can add within 10 and is learning to cross 10.
Does the worksheet have answers?
Yes. Page 2 is an answer key for parents and teachers; page 1 has only the sums.
Is it free to print?
Yes. Download the free two-page A4 PDF or use Print. No sign-in is needed.