Addition to 20 crossing 10
On this page children practise adding within 20 when the ones cross 10, like 8 + 5. Start with the short method and the examples, then use the online practice or print a worksheet with answers.
How to solve this
- Look at how many you need to reach 10.
- Split the second number so part of it makes 10.
- Add the rest on top of 10.
Examples
8 + 5 = ?
13
7 + 6 = ?
13
Practice problems with answers
Solve these problems on paper or out loud, then check the answer key. The online practice and the printable worksheet give a new set every time.
- 9 + 3 = ___
- 7 + ___ = 13
- 2 + 9 = ___
- 8 + 3 = ___
- 6 + 7 = ___
- 6 + 6 = ___
- 6 + ___ = 13
- 9 + ___ = 15
Show answers
- 12
- 6
- 11
- 11
- 13
- 12
- 7
- 6