Example : 3 - 2 = 1
Step 1: Set 3 with the thumb.
Step 2: Subtract 2 by moving down two 1-unit beads with the index finger.
Note: This example illustrates the procedure used in subtracting one or more 1-unit beads. The problems to which this procedure applies are:
2—1
3—1
4—1
6—1
7—1
8—1
9—1
3—2
4—2
7—2
8—2
9—2
4—3
8—3
9—3
9—4
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