when you multiply by 10^ any power go by this rule:
whatever the number is is the number of times you are going to move the decimal. If the number is negative you move the decimal to the left; if the number is positive you move the decimal to the right. In this case 1.3 x 10^-4 moves the decimal 4 places to the left and gives us
0.00013
To turn this into a percentage now multiply by 100 which moves the decimal back right 2 places for a percentage of 0.013 %
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when you multiply by 10^ any power go by this rule:
whatever the number is is the number of times you are going to move the decimal. If the number is negative you move the decimal to the left; if the number is positive you move the decimal to the right. In this case 1.3 x 10^-4 moves the decimal 4 places to the left and gives us
0.00013
To turn this into a percentage now multiply by 100 which moves the decimal back right 2 places for a percentage of 0.013 %