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There's nothing to change here. There is no advantage or reason to write 4.20 in scientific notation. Technically, however, it could be written as 4.20 × 100, but this is not normally done.

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βˆ™ 12y ago
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βˆ™ 12y ago

4.2 X 102

The zero is superfluous.

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Q: What is 4.20 in scientific notation?
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