http://www.topmarks.co.uk/maths-games/hit-the-button
Select ‘Number bonds’ (green button). Click on the first category, titled ‘Make 10’. Practise this a few times to see the number bonds to 10 you can find. Don’t forget to check on your fingers! To extend this, progress to making 20. Remember to compare bonds to 20 with bonds to 10 e.g. 4+6=10 and 6+4=10, therefore, 14+6=20 and also 16+4=20.
Another fun game is ‘Aliens pairs to 10’. Play this by clicking the link below