Problems

Change Un-Known

1.   The farmer has twenty-eight cows. She buys more cows at the stock sale. Now she has thirty-three cows. How many cows did the farmer buy?

2.   26 + ___ = 31
3.   25 + ___ = 46

Challenge

4.   320 + ___ =  345

Use Explain Everything to show how you thought through your answers. A lot of the time it is not the answer that is the most important part it is the thinking process used to find an answer.