0.45
Seven and eighty-eight hundredths.
one and three hundredths
12.44
Two and twenty-six hundredths.
825.0
By leaving it alone because it is already a decimal
Five hundred thirteen and ninety-five hundredths.
70
0.15 = 15 hundredths 0.015 = 15 thousandths 0.0015 = 15 ten thousandths
Eight hundred forty-three billion, two hundred eight million, seven hundred thirty-two thousand, eight hundred thirty-three.
With great difficulty because decimal numbers weren't used by the Romans