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2 x 10-1 = 0.2

The negative powers are the reciprocals of the positive powers:

10-1 is the same as 1/101

10-2 is the same as 1/102

etc

So:

2 x 10-1 = 2 x 1/101

= 2 x 1/10

= 2 / 10

= 0.2

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Q: What is the answer to 2 times 10 to the negative first power?
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