Subtraction flash cards are pretty cool because they help equip your child for school! Make subtraction synonymous with fun! Don't wait for Parent Teacher Conferences to find out that your child needs practice with his or her math facts. Buy them today and watch your child become a subtraction superstar! Product# 04007; ISBN-13: 978-0-938-25692-2; Contents: 56 cards; Size: 3.375" x 6.375"; Ages 6+