Provide practice in basic operations, greater than and less than, random number sets, simplifying and combining integers and pre-algebra skills with this set of 2cm cubes that are numbered 1-5 with positive and negative signs. Ideal for grades 4+ and ages 9 and up. Warning Choking Hazard Small Parts not for childern under 3 years. Each individual set contains 12 Foam Dice, Bundle of 6 sets, 72 Foam Dice total.