A point separates the whole numbers from the decimal numbers. The point is called a decimal place, and anything after the decimal place symbolises a fraction of a number.
For example, 1.5 = 1 and a half
The 5 is in the 'tenths' column, which means any number in that column = 1/10 x the number, so in this case, 1/10 x 5 = 0.5 = a half.
If you have a number like 1.25, the 2 is in the 'tenths' column, and the 5 is in the 'hundredths' column.
This shows 1 + 2 tenths (2/10) + 5 hundredths (5/100), which is the same as one and a quarter.
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What kind of mathematical phrase? can you please cite some examples?
twice a number
An expression.
an open sentence.
it is a varible