-- Add the two decimals.
-- Divide the sum by 2.
The answer will be a decimal that's precisely exactly midway between the original two.
A lot of people would call it the "mean" or "average" of the original two decimals.
But we can still call it the "number in between". It's OK.
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There is no decimal number immediately after. Given any decimal number greater than 1.25 it is always possible to find one between 1.25 and that number. And then one between 1.25 and thatnumber, and so on.
You find the number in between the two modes. It could be a decimal.
An irrational number is expressed as a non-repeating decimal that goes on forever. Write out the enough of the decimal expansion of each number to find the first digit where the two numbers disagree. Truncate the larger number at that digit, and the result is a rational number (terminating decimal) that is between the two.
you put a number with a decimal
The number after the decimal.