When I learned this “rule” (in first grade, I believe), it was explained that *and* separates the whole part from the fractional part: 2⅔=*two and two thirds*. The word *and* would only represent the decimal point in decimal numbers when they are read out in the formal “fractional” reading of decimals, as 2.3=*two and three tenths*, or 1.75=*one and seventy-five one-hundredths*. That is, according to this rule, **one hundred and fifty* is ungrammatical because, if it is supposed to mean 150, it should be *one hundred fifty*, and if it is supposed to be mean 100.50, it should be *one hundred and fifty one-hundredths*. The rationale behind the rule is that you should only have one *and* in a phrase, so if the number were 403⅞, you wouldn’t say *four hundred ***and** three **and** seven eighths.

Of course, most of the time the decimal point is read as *point*: 2.3=*two point three*; 1.75=*one point seven five* or *one point seventy-five*; 100.50=*one hundred point five zero*, *one hundred point five oh*, or *one hundred point fifty*. The fractional reading of decimal numbers also starts to become a bit ridiculous if there are more than three digits after the decimal point: nobody would say 3.14159265=*three and fourteen million one hundred fifty-nine thousand two hundred sixty-five one hundred millionths*.

As you have undoubtedly observed, many Americans don’t follow the rule about *and* only being used to separate whole and fractional parts, and insert *and* just before the units of a number less than one hundred, although the forms without *and* are quite common too.

457 *four hundred fifty-seven* or *four hundred and fifty-seven*

2001 *two thousand one* or *two thousand and one*

1,000,001 *one million one* or *one million and one*

This usage is *informal* but not *incorrect*. I wouldn't use it in official business documents, but it can be freely used in speech or less formal contexts.

While statements like "seventy-three hundred" are rarer than their equivalents for numbers below 2000, they're perfectly intelligible and frequently used.

## Best Answer

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OR

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