Let's see how well you can add! There are wooden cutout blocks of numbers 1 to 10 in increasing height. Put numbers 1 and 2 on top of each other to make them the same height as number 3! Or try arriving at the height of number 8. It could be by putting 5, 2 and 1 together, or by stacking 4,3 and 1 on top of each other! There are so many ways of arriving at the same number! Stack the correct numbers together and learn all of them! This product is 100% non-toxic and child safe. It comes in a wooden box for easy storage.