Here its says round to the nearest whole number
The given number of 4.56
Since we are given the nearest whole number, we have to round the fraction after the decimal .56 to the next whole number
Since the rounding of 0.56 would be 1, we would have 4.56 = 4 + 0.56 = 4+1 =5
So the rounded whole number for 4.56 = 5
