Answer:
when it lies between an integer part and a fractional part
Explanation:
You want to know when "and" is used in the reading of a decimal number.
And
The word "and" is used to signify a decimal point when pronouncing a decimal number. It is only needed when the number has both an integer part and a decimal fraction.
Examples
23. — "twenty-three"
23.6 — "twenty-three and six tenths"
.6 — "six tenths"
There is a tendency to want to use "and" between periods of a large integer. It is not appropriate there.
4,070,600,002 — "four billion seventy million six hundred thousand two"
One needs to be careful with pronunciation (and/or punctuation):
610,000.0600 — "six hundred ten thousand and six hundred ten-thousandths."
610,000.610 — "six hundred ten thousand and six hundred ten thousandths."
One distinguishes these last two numbers by the length and placement of the pause when pronouncing the fractional part. In the first of these, the "ten-thousandths" is separated from "six hundred". In the latter case, the "six hundred ten" is separated from the "thousandths." This problem will generally arise only when there are trailing zeros that are significant.
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