Tom has been given 35 chores to complete today. This morning he finished 7 of them. How many chores does he now have left to do?

Tom has been given 35 chores to complete today. This morning he finished 7 of them. How many chores does he now have left to do?This is simple arithmetic: You take the number of chores in total (35) and subtract the ones he has completed (7) and this sets up an equation:

35 - 7 = 28

And that's how you get 28!