Draw four vertical parallel lines and label then from left to right by M C X and I,,, obtain and a collection of convenient. Counters,,,, like checkers or pennies. A counter will represent 1 10 100,,,, or1 000 units according as it is placed on the I X C,,, Or M line.To reduce the number of counters which may sub subseuently appear on a line we agree to replace any five counters on a. Line by one counter in the space just to the left of that line. Any number,,,,, less than 10 000 may then be represented on. Our frame of lines by placing not more than four counters on any line,,,,, and not more than one counter in the space just. To the left of that line.
....Let us now add.........
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