Adding Double Digits


1. Enter two double-digit numbers that are to be added together into the provided boxes. 2. Move the slider so that the two pictorial representations overlap. 3. If any of the shaded regions overlap, then there will need to be a carry. Move the units slider, if required, to carry 10 ones over to the tens columns. Move the tens slider, if required, to carry 10 tens over as a hundred. 4. Click the 'Reset' button to restart the process.