Free interactive math game: Day of Week — Tuesday + 10 days?. Part of the Units & Time category on MathKite.
Taken from the generator that powers this exercise. A fresh set appears every time the page is opened, and the printable worksheet holds ten of them.
Finding which day of the week a future date falls on.
Weeks repeat every seven days, so divide the number of days by 7 and move forward only by the remainder.
Twenty days after a Monday: 20 : 7 leaves 6, and six days on from Monday is Sunday.
Counting every day one by one. Only the remainder after dividing by seven changes the day.