How do you write $0.721$ in scientific notation?

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Answer 1 · 2016-08-18T22:10:42

$0.721 =7.21xx10^-1$

In scientific notation, there must be only 1 digit in front of the decimal point. The size of the number is given as a power of 10

$0.721 =7.21xx10^-1$

Consider the following:

$0.721 = 721/1000 = 72.1/100 = 7.21/10$

Using laws of indices, we can write

$7.21/10 =7.21 xx 10^(-1)$

How do you write 0.7210.721 in scientific notation?