mrkingmath.bsky.social
@mrkingmath.bsky.social
Math Instructional Coach
I had the same thought this morning when I saw it posted. One of my high school teachers had that on the wall in the late 80s! When I started teaching in the mid 90s I got a copy and hung it on the wall. All my students wanted to be a DJ🤦🏻
August 12, 2025 at 2:51 PM
I will have to give it a look. Ender’s Game is one of my favorites.
June 25, 2025 at 4:23 PM
I used that hack soooooo much on handheld Casios in the late eighties 😂. Reciprocal button made some things way easier to deal with.
April 23, 2025 at 1:21 PM
Hey Howie! It was a pleasure meeting you in Chicago this past fall and again in Franklin, Indiana a couple months ago :)
April 9, 2025 at 5:55 PM
Feels specific to me. Are you leaving R1, R2, or R3? 3 different ways to do it.
April 3, 2025 at 12:47 AM
I find it often helps to think of the complement.

You’re essentially asking which red marble are we leaving in the bag. So one possibility for each red marble that’s left behind. So 3 different outcomes.

Assuming the order of the marbles you do choose doesn’t matter.
April 2, 2025 at 3:40 PM
I’m intrigued by the 24. I want to hear more about their thinking.
March 26, 2025 at 6:20 PM
When I saw 13 in the middle I decided to count 13’s. 5 all together so 65.
March 25, 2025 at 1:20 AM
I’m waaaay late to the party on this one, but many times (not all) you can give the problem AND the answer, then to quote the Backstreet Boys, “Tell Me Why…”
March 14, 2025 at 2:08 PM
I was wondering the same thing at first. Place value alignment issues aside, that’s quite clever.
March 13, 2025 at 5:46 PM
Not sure what happened to my first failed attempt to share this 3Blue1Brown video, but I found it helpful when wondering about the same thing.
March 12, 2025 at 6:35 PM
There we go!
Why slicing a cone gives an ellipse (beautiful proof)
YouTube video by 3Blue1Brown
youtu.be
March 12, 2025 at 6:34 PM
Seriously, Calc 3 was the easiest and even most fun Calc class I had. It’s not even close.
February 14, 2025 at 10:16 PM
Because I can <see> Calc 3 figures and triple integrals are not that big a deal.
February 14, 2025 at 10:13 PM
I see Paddy did the same thing, but I noticed that 20 was in the middle of the two numbers so I treated it as (20-4) x (20+4). That got me to 400 - 16 = 384
February 11, 2025 at 2:37 PM
Definitely worth it!
February 9, 2025 at 12:13 AM
January scenery in Indiana is stunning 😂

I know that 87.5% is equivalent to 7/8. 7/8 of 80 is 70.
February 3, 2025 at 6:44 PM
It was awesome having you in Indiana. Thanks for coming :)
January 27, 2025 at 12:04 AM
As someone from Indiana who will be attending, let me be the first to say suck it up, buttercup. That’s how we role 😂

Seriously, it sucks 🥶. It hurts your face if the wind blows. I agree that layers is the way to go. Have something for your ears and gloves are a must.
January 24, 2025 at 5:44 PM
Oh, and you won’t forgive him for putting the announcer jinx on Fletch like that.
January 18, 2025 at 11:12 PM
He was particularly bad today.
January 18, 2025 at 11:11 PM
Why not both? The procedure doesn’t have to die, it just needs to be accompanied by conceptual understanding. It just needs to not be taught in isolation as a procedure to be mimicked.
January 18, 2025 at 11:09 PM
404 Error :(
January 10, 2025 at 7:24 PM
100% lemon juice with added ingredients is a strange phrase 🤦🏻
December 25, 2024 at 12:38 AM