You may cut along the black lines to create individual cards or leave as is. Each card has four hearts; three of the four hearts have numbers on them. There are also dots that the children can count to figure the missing number. Counters can also be placed on the dots. The missing number can be cut and pasted on the heart. The children can also write the missing number in a box provided. Blank hearts are also provided for you to use to write your own numbers.
I recommend laminating the dot cards as well as the blank hearts card, and using dry erase markers for multiple use of this activity.