7.15 = (7 x 1) + (1/10) + (5/100)
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Fifteen and seven hundredths.
7.15
15.73 on word form is 'Fifteen point seven three'. NB You correspondent writing 'fifteen and seventy three hundredths. is correct. However, it could still be read as as fraction '73/100'. However it is incorrect to say or write , 'Fifteen point seventy three'. Becasue the '7' in in the teneths column and the '3' in the hundredths column; it is NOT a numerical unit.
707.04 in expanded form = (7 x 100) + (0 x 10) + (7 x 1) + (0/10) + (4/100) or seven hundred seven and four hundredths.
To write nine and fifteen hundredths in standard form, you would represent it as 9.15. In this form, the decimal point separates the whole number (9) from the decimal portion (15 hundredths or 0.15). This standard form is a concise and clear way to represent the numerical value of nine and fifteen hundredths.