Rounding to the nearest whole number means to estimate the whole number, like 10.43 would be 10.
The rule you need to remember with rounding is if the decimal in the tenths place (0.x0, x being the tenths place) is 5 or higher. Our number is 2.15, which does not have 5 or higher, so we round down to 2.00.
2.15 rounded to the nearest whole number is 2.00.
I hope this helps!
