This is more like a 2-Act than a 3-Act...
What fraction of the container is filled with pretzels?
|Does this help?|
This one got tweeted out:
How many muffins? How do you know?#facultyloungemath pic.twitter.com/k64TqH61GJ— Joe Schwartz (@JSchwartz10a) November 15, 2016
@globalmathtask @JSchwartz10a thanks for the muffin challenge pic.twitter.com/i83ZC4lCZm— Jennifer Tymkin (@tymkinmama) November 17, 2016
I shiftd 'extras' ⬅. Lone 1 in right tray ↖ to empty spot @ top in 2nd tray. 2 extra in middle ↖ to 1st tray to make (3x9)+1 extra in 1st=28 https://t.co/zvCC9mxtdZ— Maria Riverso (@RiversoMaria) November 17, 2016
@JSchwartz10a So pleasing to look at!— 17th & Margaret (@GrainBrowth) November 16, 2016
Working w/ square #'s lately, so I see "1 less than 9", "1 more than 9", and "1 more than 9". pic.twitter.com/VuddopuCxS
A Faculty Lounge 3-Act
Washing Up from Joe Schwartz on Vimeo.
Main Question: How many squirts will the machine dispense until it runs out of soap?
|Inside. According to the company, 0.4 mL of liquid foam soap is dispensed each time it's activated.|
|The dispenser holds 1 bag. Each bag holds 1,200 mL of foam soap.|
My first attempt at figuring this out didn't go so good.
|I added 3 + 10 + 100. I don't know... 113 handwashings just seemed too low.|
So I tried something different...
|3,000 was more like it!|
|Thinking additively, not multiplicatively.|
The dispenser can be set to squirt 0.7 mL of soap per activation. How many hand washings per bag?
A jar of pretzels, trays of muffins, a cookie, a soap dispenser; in my previous life they would have been things to eat and a way to promote good hygiene. But thanks to Dan, Andrew, Graham, Marilyn, Robert, Tracey, Michael, Simon, Kristin, Fawn, Max, Annie, Andy, and the rest of the MTBoS crew, I now see them as opportunities to notice and wonder, estimate, spark a number talk, and create and solve problems. It's a gift I'm thankful for. Hope they don't mind if I re-gift.