Doubling starts small and grows very fast, one square after another.
Doubling means twice as many each time: 1, 2, 4, 8, 16.
Sissa asked the king for rice on a chessboard: one grain on the first square, and each square holding double the one before.
It starts so small, and then it grows so fast. All ten squares held 1023 grains, about a handful of rice, but the board has 64 squares.
By the twentieth square the pile would fill a sack, and by the fortieth it would be as big as the palace.
These are some of the questions on the sets. The printable sheets have more and an answer key.
16. Double 8 is 16.
No. It adds two each time. Doubling goes 2, 4, 8, 16.
1024. Double 512 is 1024, not 513.
54. 64 − 10 = 54.
With a grown-up, fold a paper in half again and again and count the layers. That is doubling!
Try it with paper: fold a sheet in half again and again, and count the layers together. This is a story about growing very fast. There is no money in it.
