What are the similarities between addition and subtraction?

At the time, my class seemed to grasp the concept of fact families, relating addition and subtraction facts. Now, we are focusing on two-digit subtraction facts. Some students are doing well, some are having difficulty. Sadly, I noticed that they have forgotten about the relationship between addition and subtraction when solving problems. read more

Addition and multiplication are both combining actions, and subtraction and division are both separating actions. The difference between addition and multiplication or subtraction and division is thus a matter of “style ” —how the combining or separating is done: “just ” or “neatly. read more