To write 15.9 as words, you would say "fifteen point nine." This represents the whole number 15 followed by the decimal point and the fractional part 0.9, which is pronounced as "nine tenths."
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159 million is 159000000.
7.95 = 159/20
159 is an integer,neither a fraction nor a mixed number.
Write 1.59 in expanded form
31.8 = 31.8/1 = 318/10 = 159/5