It is really important to be able to add two small numbers quickly and accurately.
This will help you when you need to add larger numbers using more formal methods.
https://www.topmarks.co.uk/Flash.aspx?f=loopcardsv6
Try the loop cards for addition using this web site.
http://www.arcademics.com/games/jet-ski/jet-ski.html
Jet ski addition is very popular in class and everyone can always do with practising adding 2 small numbers really quickly.
Rather than type your name in, just type a letter and that will show as your jet ski in the race!