This is part of Wordless Wednesday…
Tag: Wordless Wednesday
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Fahrenheit to Celsius – Graphically!
Part of Wordless Wednesday…
The beautiful and talented Heather at Freebies4Mom.com sent me a post on An Easy Way to Convert Celsius to Fahrenheit.
It inspired me to draw the graphs of Celsius in terms of Fahrenheit and Fahrenheit in terms of Celsius.
The conversion from Celsius to Fahrenheit and back again can be strange. One way to understand it is on a graph. And you can use this to teach some linear algebra too! Notice these two intersect at (-40, -40). Which means that -40°F is -40°C!
Use it to convert temperatures.
The x values on the red line are Celsius – so find the °C you have and then look at the y-value to convert to °F.
It’s just the opposite on the purple line.
Okay, fine. This isn’t the greatest way to convert – but it’s exciting to see it graphically. And it might be easier to convert this way for someone who’s more visual.
Use it to teach math!
These two lines are inverses of each other. So the coordinates of one are switched to make the other.
Also, they mirror image across that 45° line. I marked the line with dashes and wrote on it.
And if you’re into this, their functional composition (both ways) is… x! (not factorial)
Compare and Contrast…
Take a look at the way J.D.Roth did it and then look at the graphs I have. Let your students find the way they like the best. And encourage them to create new ways!
Oh, yeah – and share what happens in the comments!
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Seeing Rectangles in Rapunzel's Hair
Part of Wordless Wednesday…
I was walking out of her room when K8 shrieked, “A rectangle!”
I looked and she was pointing directly at her Rapunzel bag. It took me a second, but I saw it when she said, “Her hair is a rectangle!”
Amazing!
Share your thoughts in the comments or on twitter/x.
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A Halloween Puzzle: Rubik's Cube
Part of Wordless Wednesday…
This is alli (lower case “a”) at my doc’s office, wearing her fun Rubik’s Cube costume. From the photos below, can you deduce what 10 color squares aren’t shown — 9 on the bottom and one where her neck is?
As a bonus — is it actually possible to twist the Rubik’s Cube to show the patterns of the five sides as she has them?
Share your thoughts in the comments or on twitter/x.
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Extreme Sports with Extreme Math — Kitesurfing
While at the beach, we got to see an amazing sport in action: kitesurfing!
I couldn’t help but marvel at all the math this guy was doing automatically and at great speed.
And he did it effortlessly!
He probably didn’t even recognize he was doing math the whole time.
He was managing the angles of his board on the waves and calculating the angle of the kite with the wind.
And every so often he had to recalculate to turn and surf in the other direction!
Everyone does this with normal activities.
Do you know anyone who thinks they don’t do math? Watch their activities carefully, you’ll soon see that even in walking, they’re doing fast and furious calculations!
Share your thoughts in the comments or on twitter/x.
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Adding Decimals — All Wrong!
Part of Wordless Wednesday…
When substitute teaching 5th grade math today, I had the opportunity to incite a riot.
The students were calmed when I finally listened to their screams of, “line up the decimals.” And some of the girls stayed after class to add some adverbs to my comment of “two decimals in a number is weird.”
Share your thoughts in the comments or on twitter/x.
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Nature's Wonders
Part of Wordless Wednesday…
Share your thoughts in the comments or on twitter/x.
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Math Problem Quickie: Prime Number Fun on Your Wedding Day
This is the first in the Math Problem Quickies series.
The bride wanted to have all the tables labeled with prime numbers. She used all the primes through 43. Each table was set for 10 people. How many guests could come to the wedding?
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There's Math in Planting Grass
Part of Wordless Wednesday…
I’ve planted all of this Amazoy grass from Zoysia Farms.
All of it.
Doesn’t sound bad, right?
Well, each of those rectangles are 15 inches x 10 inches. And we cut them into one-square-inch pieces before planting them.
So how many did I plant?
You don’t have to be a mathematician to know the answer. It’s “HOLY COW MY BODY HURTS!”
(Sometimes the right answer isn’t a number.)
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Geometry with Cheese
