Tires aren’t just for cars and trucks. In “inner tubing,” you sit or lie down on a giant donut-shaped balloon and slide down the snowy, slippery hill. It’s called an “inner” tube because it’s from inside a truck tire. People first started snow tubing in 1820 in Switzerland, a long time before cars or trucks — so where did they get their tubes? More importantly, what happens when you spin as you slide?

*Wee ones: *If your inner tube spins once to the left, then once to the right, then once to the left, then once to the right…which way do you spin next?

*Little kids:* If you, 3 friends, and 2 snow-loving dogs all pile onto an inner tube, how many riders are there? *Bonus:* You can also ride tubes on waterslides. If you go 10 miles an hour on snow but twice as fast in water, how fast do you tube on the water?

*Big kids:* If you start sliding facing downhill, with the hill’s right side on your right, and as you slide you spin 1/2 turn to your left, then 1/4 of a turn to your right, then 3/4 turn to the left, which way are you facing now? *Bonus:* If 1/2 the tubes are double tubes (seating 2 people) and the other 1/2 are single tubes, how many tubes are there if they hold 18 people total?

*The sky’s the limit:* If your tube spins once around every 2 seconds, your friend spins once every 3 seconds, another friend spins once every 4 seconds, and the last friend spins once every 5 seconds, what’s the soonest you’ll all face forward at the same time if you all started facing forward?

Answers:

*Wee ones:* To the left.

*Little kids:* 6 riders. *Bonus:* 20 miles an hour.

*Big kids:* Downhill! The 1/2 turn faced you backwards, the 1/4 turn left you facing left, then the 3/4 turn spun you around to the front. *Bonus: *12 tubes in total: 6 singles, and 6 doubles which will seat 12 more people. If 1/2 are single and 1/2 are double, then each double and single forms a pair, and each pair holds 3 people. Then just divide that into the total of 18.

*The sky’s the limit:* In 60 seconds, the smallest multiple of 2, 3, 4 and 5. You don’t need to multiply 2 x 3 x 4 x 5 to get the smallest number, because if it’s divisible by 4, it’s already divisible by 2.