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🤦🏻

I will have to give it a look. Ender’s Game is one of my favorites.

I used that hack soooooo much on handheld Casios in the late eighties 😂. Reciprocal button made some things way easier to deal with.

Hey Howie! It was a pleasure meeting you in Chicago this past fall and again in Franklin, Indiana a couple months ago :)

Feels specific to me. Are you leaving R1, R2, or R3? 3 different ways to do it.

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.

I’m intrigued by the 24. I want to hear more about their thinking.

When I saw 13 in the middle I decided to count 13’s. 5 all together so 65.

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…”

I was wondering the same thing at first. Place value alignment issues aside, that’s quite clever.

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.

YouTube video by 3Blue1Brown Why slicing a cone gives an ellipse (beautiful proof)

There we go!

3Blue1Brown has a good video on this. I can’t figure out how to post the link for some reason.

Seriously, Calc 3 was the easiest and even most fun Calc class I had. It’s not even close.

Because I can <see> Calc 3 figures and triple integrals are not that big a deal.

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

Definitely worth it!

January scenery in Indiana is stunning 😂

I know that 87.5% is equivalent to 7/8. 7/8 of 80 is 70.

It was awesome having you in Indiana. Thanks for coming :)

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.

Oh, and you won’t forgive him for putting the announcer jinx on Fletch like that.

He was particularly bad today.

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.

404 Error :(

100% lemon juice with added ingredients is a strange phrase 🤦🏻

I’ve long said Algebra isn’t as bad as people say. The real problem is needs better PR and branding. People DO use it all the time. They just think they don’t because they mistake the whole for the algorithms and symbols.

FWIW my answer was “50?” Then I watched your answer for confirmation. It wasn’t surprising per se, it just felt like you had to get to 49/50. It felt weird that it would take that much to get down there though.

Was working with a 5th grade teacher laying groundwork for adding fractions. She did a fantastic job using Polypad fraction bars estimating whether addends and sums were close to 0, 0.5, and 1. It’s her first year doing 5th grade math too!

Out of curiosity, did you see the 9 at the top, or at the bottom? (I saw the 9 at the top first).