1.00 x 10-4
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100 is already rounded to one significant figure.
It then is 40000 to one significant figure
It is 10
When expressing a number to one significant figure, you round it to the nearest power of 10. In this case, 150.932 to 1 significant figure would be 200. Since 150.932 is closer to 200 than to 100, the rounded value is 200.
Rounded to one significant figure it becomes 40