The 2 is significant.
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200 Explanation: 2 is the one significant figure. The zeros are not significant. Round up because it is closer to 200 than to 100.
The greatest is 2 for 200 and altogether there are 5 significant figures.
200
To express 218 to one significant figure, you would round it to the nearest ten. Since 218 is closer to 220 than 210, the rounded value would be 220. This is because the first significant figure is the hundreds place, which is 2 in this case. Rounding to one significant figure means keeping only one non-zero digit.
1000 is written with one significant figure, with only the 1 being a significant figure.