Purpose of the toolLearning how to add and subtract.
Explanation of the toolThis abacus is very useful to understand place value and understand the transformation from one place to another (regrouping). Students can recognize different numbers on base ten (Ones, Tens, Hundredths, Thousands etc.)
Press the plus button to show the balls on the abacus.
Press the minus button to make the balls disappear one by one.
Press the reset button to make all the balls disappear at once.
If you have nine balls at the ones section and you press the plus button one more time, you'll see the number change from ones to tens.