1 1 is 1 2 1s are 2 3 1s are 3 4 1s are 4 5 1s are 5 6 1s are 6 And 7 1s are 7 8 1s are 8 9 1s are 9 And 10 1s are 10 With 1s you can make any Numberblock. Now, isn’t that clever? If you just add 1 or ...