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The first digit must be from 1 to 9 folowed by a decimal point:-

1,200,000 = 1.2*106 which means that the decimal point must be moved 6 places to the right to get back where you started from

0.0000092 = 9.2*10-6 which means that the decimal point must be moved 6 places to the left top get back where you started from

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12y ago

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