These cards take multiplication to the next level with 4 sets of multiplication cards, each with 10 problems (that's 40 problems with answers included!). Each of the 4 sets starts with a number in the ten thousands, then gradually increases to the millions, which makes them perfectly suited for a child practicing checkerboard, bead frame, golden bead frame, or just practicing the abstract (pencil and paper) method. The first set is color-coded to math the Montessori materials, but in set 2 the