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Addition on the abacus is straight forward: simply add the numbers in the left-to-right sequence. (One could add from right to left, the result is the same.)
Example 1: 146 + 52
Example 2: 42 + 33
Example 3: 28 + 16
Example 4: 378 + 1659
Note when adding, we are not simply adding beads but sometimes removing beads. In mathematical expression, these operations are as follows:
+2 = +5 -3
+2 = +10 - 8
+6 = +10 - 4
+6 = +1 - 5 + 10
......
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