6.78 x 10-9 in decimal form = 0.00000000678
(move the decimal point 9 places to the left)
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9 tenths = 9/10 = 9 ÷ 10 = 0.9
0.0000000013
0.9 as a decimal and 9 over 10 as a fraction.
0.90 is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. And, since it is a decimal fraction, there is not another simpler decimal form. Its equivalent, in rational form, is 90/100 which simplifies to 9/10.
0.9 is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. And, being a decimal, there is no simpler form. Its rational equivalent is 9/10 which cannot be simplified.