Find the card to match the 10 frames.
I think the first thing we should do is look at our 10 frames and find out how many
black dots there are. On the left, the first 10 frame is completely full. This means there are 10 in that frame. Our second frame only has two out of 10 filled in. Our second frame is two. 10 plus two equals 12. Let’s go and check our cards and see how many of them have a total of 12.
The first card tells us that 12 is one and two more ones. Our second card tells us that 12 is one group of 10 and two more ones. The third card says 21 is one group of 10 and two more ones. Wait! We’re not talking about 21. We’re talking about 12. That means the third card can’t possibly be true.
Now we have to choose between the first and the second card. The first card said 12 is one and two more ones. 12 is one and two more ones. One and two more ones is the same thing as saying one plus two. And one plus two equals three, not 12. Our last option says 12 is one group of 10 and two more ones. 12 is equal to one group of 10 and two more ones. This card correctly matches our 10