Underlining a 6 instead of a 9 often relates to distinguishing between similar-looking digits in contexts like data entry or analysis. Since a 6 and a 9 can be easily confused, underlining the 6 can help clarify that it is not a 9. This practice enhances accuracy and minimizes errors in interpretation. In some cases, underlining may also reflect specific formatting or coding conventions used in certain fields.
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If a number has an underline, it can be difficult to distinguish between a 6 and a 9. Typically, a 6 has the loop at the bottom facing downwards, while a 9 has the loop facing upwards. If the underline is drawn under the number, it may obscure the loop, but examining the shape of the number can help clarify which one it is. Context, such as the number's position in a sequence or mathematical expression, can also provide clues.
In games they underline 6 and 9 s that we can know that it's a 9 or a 6, but they don't do that to 16 and 19 because they know that in the tens place, there's a 1, they should do that to 99, 66, etc
3/10
give the value of the underline digit
The 4 is in the tenths place value.