I'm Bon Crowder and the photos above are both of me - in 1989 and today. I'm a Generation X mom of Generation Z kids.

I began peer tutoring in high school in 1984. MathFour.com is the 2015 version of me helping peers be comfortable in math.

If you're a Gen-X parent, you're in the right place!

Tag Archives: video

Pi Day Videos – Song & Limerick

March 14 is Pi Day. Mathematicians, teachers, and math geeks around the world celebrate.

Especially at 1:59. That’s when the date and time is 3/14 1:59 – pi to 5 digits.

My treat for you last year was a photo of pi decorated cookies. This year the treat is even more delicious – a Pi Song from Vi Hart and a Pi Limerick from me.

Vi Hart can sing!

You can’t deny Vi Hart has mathematical and creative talent. But who knew she had a musical voice!

My Pi Limerick – because I can’t sing.

I can’t carry a tune in a bucket much less associate digits with musical notes.

But I can remember pi to 5 decimal places with the help of this limerick:

Happy Pi Day, y’all!

4 Responses to Pi Day Videos – Song & Limerick

• Bon says:

Very catchy, tune, Hans! Thanks for sharing it!

1. T. says:

My highschool Trig teacher (Mr. Campbell — a good man!) taught us to remember the digits of pi by chanting the rhyme ‘sine, cosine, cosine, sine, 3.14159’.

The order of sines and cosines refers to how to apply Euler’s formula to sine [e.g. sin(x+y) = sin(x)cos(y) + cos(x)sin(y)]. Though I had to look up the formula, I have *never* forgotten the rhyme!

• Bon says:

Thanks for the mnemonic tip, T.!

Variations on the Number 4

Here are some variations on the number 4. Some are nice, some are a little freaky. Continue Reading

2 Responses to Variations on the Number 3

1. Allen Arnold says:

A 3-sided polygon, a triangle, is the only “rigid” shape. Any polygon with more than 3 sides is not rigid because it can be easily deformed. A triangle, by contrast, is strong because it resists deformation. Therefore, triangles are often used in construction. For example, “trusses” are structures made of steel beams in the form of triangles. Often, many smaller triangles are welded together to form larger triangles for greater strength. Trusses are used wherever strength is needed: bridges and supports of all kinds. The Eiffel Tower is made of trusses consisting of thousands of steel triangle-shaped constructions.

• Bon says:

Very cool, Allen! Reading that gave me goosebumps (circular, but they don’t need to be rigid!)

Variations on the Number 2

Here are some variations on the number 2, as well as a few facts. Continue Reading

Variations on Numbers

Do you practice fact families with your children? How about variations on different numbers? This is the first in a video series showing variations on numbers. Check it out! Continue Reading

Area of a Right Triangle

Calculating the area of a right triangle includes remembering the formula, and doing the arithmetic correctly. Here’s a short video demonstrating it. Continue Reading

One Response to Area of a Right Triangle

1. T. says:

You are so entertaining; I chuckled a few times through this! But “that’s just going a bit too far” (as you might say). : )

Parent Influence in Math – Smile!

If you think you’re bad at math, maybe you shouldn’t say it. Check out how your social modeling affects your kids. Continue Reading

2 Responses to Permutations in Braiding Hair

1. Oh, I’m laughing, because this me!

Now, what are the permutations for a fish tail braid? 😉

• Bon says:

Error 509 Bandwidth Limit Exceeded: processing overload in the author’s brain.

The QAMA Calculator – The One Calculator You Shouldn't Burn!

There’s one calculator that just might save the fate of all others! Continue Reading

What is &lt;em&gt;That’s Math!&lt;/em&gt;?

You’ve seen it advertised – but what is That’s Math! – really? Continue Reading

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