My geometry kids worked on this fun problem:

Below is an orderly way to arrange the whole numbers. What number is directly above 100? Directly above 1000? What is a way to tell what number is directly above any given number?

.

.

.

16 17 18 19 20 21

11 12 13 14 15

7 8 9 10

4 5 6

2 3

1

The algebra kids played Solving Equations Block game: