I used another task, Rope Jumper, from Graham Fletcher. My students love this one each year. I like how the ratio stopped on is “not easy” 41:7, so the students can get close with some easy multiples, but they have to use another method to figure out those last 2 seconds. Some of them estimate, some figure out the rate of jumps per second. Some round the rate to an easier number.
I think it’s funny that every class wonders if she’s a robot. And then when we watch Act 3, they’re disappointed she doesn’t quite make it to their expected values. Because she is a human and slows down as she gets tired!
Here’s the board after I noted their wonderings and then later jotted down their strategies.