These are matching cards to learn multiplication and division using common core. I pulled the idea from Engage NY.
Some examples from the flashcards include:
5 fives + 3 fives = 8 fives
(10 divided by 2) + (4 divided by 2) or 5 + 2 = 7 is the same as 14 divided by 2 = 7
I used this for centers/review practice since this was the first time my students interacted with this. It very much connects to algebra and being able to manipulate numbers.