0.002537 =~ 0.00254 (3 sig. fig.)
0.002537 =~ 0.003 (3 decimal places)
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Height, length, width.
12300000 or better still, 1.23*107
21,600 using only four significant figures is still 21,600.
There are 3 significant figures
273.821 contains 6 significant figures. Rounding that to Hundredths (5 sig. figures) it becomes 273.82 Rounding it to Tenths (4 sig. figures) it becomes 273.8 And Rounding it to the nearest whole number (3 sig. figures) it becomes 274 etc., etc.