Adding and Subtracting One-Digit Numbers (2)

Example :    2 + 5 = 7 

Step 1: Set 2

Step 2: Move down 5 with the index finger.

Note: This example illustrates the procedure used in adding a 5-unit bead. The problems to which this procedure applies are:  

1+5 
2+5  
3+5 
4+5