12.9 IS a decimal number. It is twelve and nine tenths.
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There are no decimal words! The number is eight hundredths.
To write 7.5 in words, you would write "seven point five." This represents the whole number 7 followed by a decimal point and the fractional part 5 tenths. In this case, the decimal point separates the whole number from the fractional part, and the word "point" is used to indicate the decimal point.
To write 41.50 in words, you would write "forty-one and fifty hundredths." This breaks down the number into its whole number and decimal parts, with "forty-one" representing the whole number 41 and "fifty hundredths" representing the decimal 0.50.
To write the number 7.002 in words, you would say "seven point zero zero two." This is because the decimal point separates the whole number part (7) from the decimal part (002). When reading decimal numbers, each digit after the decimal point is pronounced individually.
It is 40.