Mount Rushmore is a giant sculpture of 4 great presidents — George Washington, Thomas Jefferson, Teddy Roosevelt and Abraham Lincoln — carved into a South Dakota mountain! Their heads are 60 feet tall, so chipping out those faces was a huge job. Every day from 1927 to 1941, over 400 men and women worked as drillers, carvers swinging from ropes, and cooks for the group. 90% of the rock was actually blasted away with dynamite, then the carvers swung in to polish by hand. The sculpture was never totally finished, but we can still tell who’s who.

*Wee ones:* What numbers do you say to count the 4 presidents here?

*Little kids:* President Roosevelt is the one with the mustache. How many presidents are sitting to *his* right? *Bonus:* Workers would sell chunks of rock to visitors. If you sold 1 rock for $2, for how much would you have to sell a second rock to make $10 total?

*Big kids:* The tops of the presidents’ heads are 500 feet above ground. Since their heads are 60 feet tall, how high off the ground are their chins? *Bonus:* If you sell rocks for either $2 or $7 apiece, how many combinations of the two could you sell to make $23?

Answers:

*Wee ones:* 1, 2, 3, 4.

*Little kids:* 2 presidents (Washington and Jefferson). *Bonus:* For $8.

*Big kids:* 440 feet. *Bonus:* Only 2 possibilities: one $7 rock and eight $2 rocks, or three $7 rocks and one $2. You can’t sell 0 or 2 big rocks, because then the leftover is an odd number — you can’t fill that by selling $2 rocks.