Brigid worked 16.75 hr
Kevin worked 12.50 hr
Round to the nearest whole number by looking if the tenths are greater than 5
Round up Brigid to 17 hrs because 7 is greater than or equal to 5
Round up Kevin to 13 hrs because 5 is greater than or equal to 5
Subtract their times
17-13= 4 hrs
Comparing it to the original answer (if we didn't estimate) of 4.25, it is pretty close and 4 hrs is a good estimate
