Standard Rounding:
3450
3500
4000
Algebraic Rounding:
3450
3400
3000
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17.9867 to 3 significant figures is 18.0
0.036 The significant figures are indicated by the square brackets 0.0[35550], so we round this part of the figure.
The number 10.989 rounded to 3 significant figures is 11.0
130
0.26