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So I am learning Trachtenberg Method of numerical calculations currently. I have learnt multiplication and am learning division now. While solving a question, I came across an anomaly. The calculation I was doing was 15092 / 15. The correct answer should be 1006 with 2 as a remainder. But during the calculation process I get 1009 as the answer which is wrong. I.E. when dividing 92 by 1(the tens part of 15) I am getting 9 instead of 6(90/15=6 right).

I know that whenever the NT is larger than your last working figure you reduce it by 1. However in this case, the quotient which we are constructing itself is wrong, I am getting 1009 instead of 1006.

I found out that this issue occurs when dividing by numbers with a '1' in the Tens place.

Let me say this again, I started with this only today so I'm a complete beginner. If anyone could please point me in the correct direction, I would be grateful.

I will attach my calculation below , thanks.

My calculation

P.S. Added false tags so that people can see it and I can get help. Really don't mind if you downvote this question, if you can guide me in the right direction pls do so

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When the first digit is $1$, the system can fail badly.

One cheat is to double the two numbers: $92/15 \mapsto 184/30$. Note that $18/3 = 6$.

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