Addition Flash Cards: Teach addition with numbers to 10, to 20 and to 100. This value pack of flash cards includes 3 sets of 54 cards for teaching addition. Covers addition to 10, to 20 and to 100. Visual arrays are provided to help children see the mathematical relationships. Teaches fast, automatic recall. A perfect activity for independent or guided learning.Details:8.1" x 3.5" x 0.9" package size3 flash card sets, 162 cardsFor ages 5 and up