SUPERB! Place the numbers on the number line. Loads of levels. Negative numbers and decimals. Play against the clock for a score. Good warm up activity useful for year 3 to year 6.
"PurposeGames.com is host to educational quiz and trivia games created by its members. In just a few minutes, you can create your very own game to share with your friends!."
A very powerful animation tool, very flexible and fully featured. Much steeper learning curve than the other options tagged. Easy to embed or download the result. Top end product, very flexible.