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You do by subtracting one from the previous number and adding 10 to the top number of the digits you are regrouping. Subtract those two digits and you should get your answer.
Adding whole numbers is the addition of decimals where the decimal part is zero; in both cases the digits are place value aligned meaning that the decimal points, which lies between the units (or ones) and tenths columns, are aligned - in the whole number the decimal point is "hiding" at the end.
Standard algorithm is when you take two digits or decimals and you put the digit or decimal with the greater value on top and the digit or decimal with the least value on the bottom and you contrast the digits/decimals to see if it greater than, less than,or equal to.
They are decimal representations of numbers which stop after a finite number of digits (or continue with an infinite string of 0s).
There is an infinite amount of decimals between 0.1 and 0.11. Write "0.10", and then add any digit or digits you like - the result will be between those two.