Comparing
see saw visual wonderful for their first introduction of a balanced equation
Ordering Numbers
Counting
Thinking about numbers using frames of 10 can be a helpful way to learn basic number facts. The four games that can be played with this applet help to develop counting and addition skills.
jumping frog on a number line. You tell the frog what to do there is no problem to solve.
Although it is in another language...wonderful for kinder and has great activities with hands, dice, 10s and 1s.