Question - what is the number between o.23 and 0.24?

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We use the digital counting system. The first number to the left of the decimal is ten to the zero power. to the left of that is the first power, second power, and so on. To the right of the decimal is ten to the -1 power or 1/10. Next is ten to the -2 power, or 1/100. Next is the -3 power, or 1/1000. We can write any number as long as it is divisible by some power of ten.

So there can be any number of numbers between 0.23 and 0.24.
0.23
0.231
0.2311
0.232
.0233157
and so on.