Add the nearest multiple of 10 and adjust
Once the technique for adding 9 to a number has been mastered, there is no problem with adding 19, 29 or 39!
5 pages
Add the nearest multiple of 10 and adjust
Once the technique for adding 9 to a number has been mastered, there is no problem with adding 19, 29 or 39!
![Preview of 'Add the nearest multiple of 10 and adjust'](https://content.urbrainy.com/1435/382153336/thumbnail_xlarge/12255_1.png)