Because density expressed in two significant figures depends on your accuracy of your measurements of mass and volume to calculate as well as any variables that you are expected to use.
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The number 151.208, when expressed to two significant figures, is 150. This is because the first two significant figures are '1' and '5', and rounding the next digit (which is '1') leads to a decrease in the last significant figure. Therefore, the rounded value is 150.
460. (the period/decimal point is necessary; otherwise 460 would be considered two significant figures)
42 has two significant figures.
23.43 rounded to two significant figures is 23.
687 to two significant figures is 690.