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A1 It means 1x103 = 1000 (three zeroes after the one)

A2 To understand why this is so, the expression 'to the power of' just means that the number concerned is multiplied by itself the appropriate number of times. Thus '10 to the power of three' means 10 x 10 x 10 which equals 1000. Scientists often use this as a shorthand way of writing large numbers.

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14y ago

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