40 + 20 = 60 20 + 40 = 60 30 + 10 = 40 10 + 30 = 40 60 + 30 = 90 30 + 60 = 90 REMEMBER: The order of the addends (the numbers you are adding) does not change the answer.
NOTE: Practice a few more problems like the examples shown on this page. Explain the comment about the order of addends to the student.