The Double set comes with one each of an Addition and Subtraction Fact Flip plus a dry erase marker w/ eraser & a mini-sand timer.
Math Fact Flips were created for students to practice, self-check, and master their basic math facts through the 12's for addition, subtraction, multiplication and division. Students "flip" to the card with the set of facts they wish to practice, cover the answers with the laminated flap and write their answers to the set of problems on the answer flap with a dry erase marker. Students can check their written answers, wipe off the answer flap and repeat challenging themselves until all sets of facts are mastered.
This tool has been vertically aligned from grade 1 through grade 5 with the color-coordinated sets of facts. In all operations, the 3's and 9's are all the same color, as are the 4's and 8's, the 5's and 10's, the 6's and the 12's and finally, the 7's and 11's.
They were created this way for 2 critical reasons. First, as an extension for students to accept the challenge of discovering the relationships of the like-colored sets of facts in addition and subtraction, and second, as students move to multiplication and division, they have seen the relationships with the color matched sets they discover fact families and their like relationships.