500
When completing word problems using subtraction, what must you always remember to do in your Number Sentences? For example: if you jot down 7, then jot down 12, and the clue to "Unlock the Problem" says "have left", what must you remember to fix before subtracting?
What is "switch the numbers around before subtracting, because you cannot subtract a larger number from a smaller number!!!" 7-12 or 12-7