Six years ago when we started homeschooling I decided to go with Singapore math. I did this because I read or heard somewhere that worldwide, kids who use this math score highest on testing. I'm not really into test scores, but it sounded good to me. Singapore has been a challenge...in a good way. One of the items that was recommended to be purchased with the math curriculum were the gram/centimeter cubes. I love hands-on anything, so I purchased them. I had no idea they would be so well used. There are uses for them K-6! The versatility of these little fellas is seemingly endless!