exercise: adding Roman numerals
Add the given numbers
5 I's equal one V. So if you have 5 balls or more on the line of units
- drag 5 balls to the red part of the line
- drag 1 ball on the line of fives from the red part to the grey part.
- drag 2 balls to the red part of the line
- drag 1 ball on the line of tens from the red part to the grey part.