OK OK OK I think I’ve got where 1024 comes from but what is going on with that 11?
Update: I think banderson2 nails it in the comments. “It comes from the power of 2. 2 = 8/4 so 8/4 + 3/4 is 11/4.”
Check out this kid’s explanation for why you end up with “+3x” from “-(-3x)”:
“You have -3x, so that’s three negatives, and then you have this other negative and that makes four…”
You can find this explanation at around 3:33 in the video below:
Exponents strike again!
(Or, maybe I misunderstood the kid’s explanation in the video? Lemme know if I did, please!)
Thanks to Jonathan for the submission.
I think the temptation I have is to call this a “careless” mistake and urge more practice. Let’s probe deeper.
1. What does this kid know and understand about exponents?
2. What’s the fastest way to help?
3. What makes this mistake so tempting?