1000 with a vinculum (horizontal bar) over the first zero.
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9,138 rounded to two significant figures is 9,100
Rounded to two significant figures, 0.00079511 is approximately equal to 0.000080.
1050 contains 4 significant digits and cannot be rounded to two significant figures without changing the value of the number.
4600
It is 0.0054 rounded to two significant figures