NumberDigit

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NumberDigit[x, n]

returns the digit coefficient of 10^n for the real-valued number x.

NumberDigit[x, n, b]

returns the coefficient of b^n in the base-b representation of x.

Get the 10^2 digit of a 210.345:

Get the 10^-1 digit of a 210.345:

Get the 2^0 bit of the Pi:
= 1

$MinPrecision
Precision