All of these are rational numbers, i.e. they can all be easily expressed as ratios or fractions. -0.002 is `-2/1000=-1/500` -3.4 is `-3 4/10=-3 2/5` and `sqrt(36)=6` which is not only rational, it is a whole number, and an integer.

All of these are rational numbers, i.e. they can all be easily expressed as ratios or fractions. -0.002 is `-2/1000=-1/500` -3.4 is `-3 4/10=-3 2/5` and `sqrt(36)=6` which is not only rational, it is a whole number, and an integer.