What is $0.0000004$ $0.0000004$ in scientific notation?

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Answer 1 · 2016-11-09T01:17:37

$4 \times 10^{- 7}$ $4 xx 10^-7$

You need one digit before the decimal point and then a power of 10.

The decimal is formed by dividing by 10 seven times. The index will be negative.

$4 \times 10^{- 7}$ $4 xx 10^-7$

Probably too late for the quiz, but you can learn it now for next time . EZ

Answer 2 · 2016-11-09T18:35:55

$0.000 0004 = 4 \times 10^{- 7}$ $0.000 000 4 = 4xx10^-7$

$0.000 0004 = 4 \times 10^{- 7}$ $0.000 000 4 = 4xx10^-7$

You have to move the decimal point until it is on the right side of the 4, to give $4.0$ $4.0$ Count how many places the decimal point moved..

As fractions: $0.4 = \frac{4}{10} = 4 \times 10^{- 1} \leftarrow$ $0.4 = 4/10 = 4xx10^-1" "larr$ one decimal place

$0.04 = \frac{4}{100} = \frac{4}{10^{2}} = 4 \times 10^{- 2} \leftarrow$ $0.04 = 4/100 = 4/10^2 = 4 xx 10^-2" "larr$ 2 decimal places

$0.004 = \frac{4}{1000} = \frac{4}{10^{- 3}} \leftarrow$ $0.004 = 4/1000= 4/10^-3" "larr$ 3 decimal places

and so on until

$0.0000004 = \frac{4}{10000000} = \frac{4}{10^{7}}$ $0.0000004 = 4/10000000 = 4/10^7$

$\frac{4}{10^{7}} = 4 \times 10^{- 7} \leftarrow$ $4/10^7 = 4 xx 10^-7" "larr$ 7 decimal places

What is 0.00000040.0000004 in scientific notation?