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We need to first move the decimal two (2) places to the left:

480 = 4.80 x 102

The 2 in 102 comes from how many places we moved the decimal. It's positive because the number it represents is larger (480 > 4.8)

With one significant figure, we need to round to the nearest whole number:

5 x 102

The answer is 5 x 102

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