what is the first step in checking for arithmetic errors when two column totals are not in balance?
The first step is to subtract the smaller column total from the larger column total to find the difference between them.
Why this is the first step
- This quick subtraction tells you exactly how far out of balance the two columns are.
- Knowing the difference helps you later spot whether the error might be a simple mis-addition, a digit transposition, or a posting to the wrong side.
Simple way to think about it
- Add each column again to be sure each total was added correctly.
- Then subtract the smaller total from the larger total.
- Use that difference as a clue while you recheck individual figures if needed.
In many bookkeeping and trial balance checks, re-adding the columns and then finding the exact difference between their totals is treated as the basic starting point for tracking down arithmetic errors.
TL;DR: First re-add each column to confirm the totals, then subtract the smaller total from the larger total to determine the difference and begin tracing the error.
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