412.272+0.00031+0.000024-1.00797+12.8 Correct number of significant figures? Why

Question

412.272+0.00031+0.000024-1.00797+12.8 Correct number of significant figures? Why is the answer 424.1 ? Shouldn't it be 424 since the lowest number of significant figures is 3 ( because of 12.8 ) ? Could you explain ? 412.272+0.00031+0.000024-1.00797+12.8 Correct number of significant figures? Why is the answer 424.1 ? Shouldn't it be 424 since the lowest number of significant figures is 3 ( because of 12.8 ) ? Could you explain ? Correct number of significant figures? Why is the answer 424.1 ? Shouldn't it be 424 since the lowest number of significant figures is 3 ( because of 12.8 ) ? Could you explain ?

Explanation / Answer

424.1

The original (424.064364) had 9 significant figures and a least significant decimal of -6.

The new format (424.1) has 4 significant figures and a least significant decimal of -1.

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