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“Subtraction Flash Cards” is a Sure and Effective Way to learn and practice Subtraction Facts up to 20. There are 40 both sides printed, divided into 2 levels,large Flash Cards. Each card has two sums printed in big and bold type and their answers on the back. Children first practice with Level 1 ( sums up to 10) cards and then with Level 2 ( up to 20) Cards. To reinforce their understanding and test knowledge of subtraction they also play group games. This way the child learns in most interactive and enjoyable way.