Using Math Problem Solving and Student Discourse

[@dlp2.0ipgkti28]

I like the questioning and feedback techniques used by the teacher in this video to teach a mathematics problem. I would like to request permission to share this video with pre-service and in-service teachers for learning purposes.

[@TeachnKidsLearn]

Hello, Can you please provide us with additional information for where you will be using this video? Please contact us at [e-mail]

[@mathmatterswithmissjen]

I LOVE the video, thanks for sharing! I'm so eager to comment this though (and by the way, I'm a math teacher). In the algebra modeled, n = the first number. But what about n = the second number -- or better yet, the "middle" number? Then you have n-1 + n + n+1, which all sum to 3n. All you have to do is divide 81 by 3, which is 27. (Which makes sense because 81 = 9*9 = 3^4, so 81 / 3^1 = 3^3 = 27.). So we could have 27+27+27, but those aren't consecutive, so make one 1 less and one 1 more, to get 26, 27, 28. One last way to think of this is that the AVERAGE of the 3 numbers has to be 81/3, which is 27. So if you need 3 consecutive ODD numbers, then they would have to still "center" around 27, and be 25, 27, 29. Or if it said to find 3 numbers, each 10 apart, that sum to 81, the answer would be 17, 27, and 37. They all must average to 27, so they sum to 81.

[@SUSHILKUMAR-vw1bx]

Nice