Whatís 1+1? Propel your little learnerís math skills with Build ín Learn 1-2-3 Count! First Builders from Mega Bloks. These big, colorful blocks are the perfect tools to teach your child basic counting skills. As your little one develops, introduce the addition and subtraction blocks for more advanced learning. Educational playtime makes learning fun and prepares your child for kindergarten. Build, play, and learn with over 50 numbers to count and stack. When playtime is over, store the set in our new eco-friendly, PVC-free tote bag.