There are 12 cards. Each card shows a 2-digit number. It asks the students to write the number in tens and ones and then asks for the equation. Students would write the equation using 10's and 1's. For example, if the number was 45, the equation would be 40 + 5 = 45.
The cards also come in black and white.
This is a great activity to go with Math Expressions Unit 4. Great review for after lesson 7.