Needs an undo feature
I wish there was a way to uncover a number without clearing the entire board. If you make a mistake you need to start over.
Response from developer
To uncover a number simply drag the marker off the chart.
Great for special Ed.
Great for students who struggle with tracking on paper hundreds charts.
teacher
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.
Hands On Hundred Chart
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.
Response from developer
To erase one number simply drag the marker of the chart.
Lovely, very useful
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.
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