Example : 14 + 25 = 39
Step 1: Set 14, with the 4 appearing on the unit rod.
Step 2: Add the 2 of 25 to the 1 on tens’ rod with the thumb. This gives 3 on tens’ rod.
Step 3: Add the remaining 5 of 25 to the 4 on B with the forefinger. This gives 9 on unit rod. The answer is 39.
Example : 45 + 27 = 72
Step 1: Set 45.
Step 2: Add the 2 of 27 to the 4 on tens’ rod. This gives 6 on tens’ rod.
Step 3: Add the remaining 7 of 27 to the 5 on unit rod. This gives 2 on unit rod and 7 on tens’ rod, as 1 is carried to the 6 on tens’ rod. The answer is 72.
Example : 79 — 23 = 56
Step 1: Set 79.
Step 2: Subtract the 2 of 23 from the 7 on tens’ rod. This leaves 5 on tens’ rod.
Step 3: Subtract the remaining 3 of 23 from the 9 on rod unit. This leaves 6 on rod unit. The answer is 56.
Example : 83 — 49 = 34
Step 1: Set 83.
Step 2: Subtract the 4 of 49 from the 8 on tens’ rod. This leaves 4 on tens’ rod.
Step 3: Subtract the remaining 9 of 49 from the 3 on unit rod. As you cannot subtract 9 from 3, borrow 1 from A This leaves 3 on tens’ rod and enables you to subtract 9 from 10 on unit rod. Add, to the 3 on unit rod, the remainder 1 of 9 from 10, and you get 4 on B. The answer is 34.
Wonderful tutorial! Thank you! I was looking for a lesson on this to teach my 8-year-old daughter. She can do simple math on the soroban, but I want to move on to move complex problems. This made it easy.
ReplyDeleteI see Cathy.
DeleteI did Not understood well the idea of adding and substacting using the abacus
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