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.
Please keep regifting!!!ReplyDelete
You've all had an impact on me as well. I respond to my students' math writing differently because of your influence.
Thanks Jamie! And keep up regifting yourself.Delete
Great problem for 5th graders to figure out!!ReplyDelete
Thanks Josh. I'm anxious to try it out with our fifth graders and see what they come up with!Delete
I love this hand soap problem. I am working with a teacher and we are about to start exploring mult. and dividing w/decimals with her 5th grade students. I think we will try this. I wonder if we could test whether or not the math matches the situation. Maybe we could put a piece of paper next to the soap and everyone could make a tally when they used the soap??ReplyDelete
Thanks Sarah. I've thought of something similar: put a piece of paper by the dispenser one morning and have everyone that uses it make a tally. Then we'd know about how many uses it gets per day. Then the kids could figure out how many days one full bag of liquid soap would last. I'm also thinking about representing the 0.4 as 4/10 since we're working right now with fractions. Lots of math there, and I'm not even talking about the paper towels they used to dry their hands!Delete
Keep up the great work and inspiration, Joe!ReplyDelete
Thanks Andrew! I appreciate your ongoing encouragement and support.Delete