I'm learning how to convert decimal to binary, and the site I'm using shows how to convert the decimal number $156_{10}$ to binary, but it really just means the integer $156$. Why do they put $156_{10}$ and not just $156$? What is the $10$ for?
2026-04-03 19:28:27.1775244507
What does the subscript mean in $156_{10}$? Why not just write $156$?
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The subscript denotes base. For example, $21_{10}$ means "$21$ in base $10$", whereas in binary (base $2$) you'd write $10101_2$.