Great for students who struggle with tracking on paper hundreds charts.

This is a great app with many features. It's nice to be able to remove any marks from the number line. With numerous ways to mark numbers kids can get a better sense of the numbers and their many multiples. The speech setting is great. The voice clearly pronounces the numbers.

Works well, however there should be a way to erase just one number without erasing all the numbers on the chart. Sometimes you just touch a number by mistake but with this current program set up you have to erase all the numbers you have been working with in ordered to get that "one" erased.

Seems to have an arbitrary limit on the number of markers that can be placed -- so it's difficult to demonstrate the Sieve of Eratosthenes using a different color for each multiple of the first few primes. Also, removing a marker is difficult and haphazard. An undo button would be useful in addition to the eraser button which clears ALL of your work. Overall, a very handy app for teachers. I'm grateful.

This is a well designed math app! Artsy and fun to interact with. From basic to more advanced, the PDF lessons & instructions are very helpful. This app didn't look as cute as some other children's math apps so I almost skipped by it. Very glad I purchased it!