Writing to Learn Math: Research prompts help students view math as a human endeavor.
Do you want your children to develop the ability to reason creatively and figure out things on their own?
Help kids practice slowing down and taking the time to fully comprehend a math topic or problem-solving situation with these classic tools of learning: Notice. Wonder. Create.
Once upon a time, when my kids and I were young…
Later the same year, not too long after our discussion of the Bill Gates proportions, I stumbled on some more data. I discovered that the median American family’s net worth was $93,100 in 2004, most of that being home equity.
This gave me another chance to play around with proportions. And since I was preparing a workshop for our regional homeschooling conference, I wrote a sample problem:
The median American family has a net worth of about $100 thousand. Bill Gates has a net worth of $56 billion. If Average Jane Homeschooler spends $100 in the vendor hall, what would be the equivalent expense for Gates?
In the last post, I explained that a proportion sets two ratios equal to each other, like equivalent fractions. Each ratio must compare similar thing to similar thing in the same order.
In this case, we are interested in the ratio “Expense compared to Net Worth.”
Continue reading Homeschool Memories: Bill Gates Proportions II
Once upon a time…
We were getting ready for the annual homeschool co-op speech contest, and a friend emailed me for help.
“Can you help us figure out how to figure out this problem?
“This is related to C’s speech. I think we have all the information we need, but I’m not sure:
“The average household income in the United States is $60,000/year. And a man’s annual income is $56 billion.
“Is there a way to figure out what this man’s value of a million dollars would be, compared to the person who earns $60,000/year? In other words, I would like to say—$1,000,000 to us is like 10 cents to Bill Gates.”
We found out later that her son’s numbers weren’t exactly right. He hadn’t understood the difference between income and net worth, so he made Gates sound richer than reality.
But the basic math principles never change, and it’s fun to play with big numbers.
Continue reading Homeschool Memories: Putting Bill Gates in Proportion
If you’re into math education — or just curious about how learning math could possibly be fun — you’ll definitely want to check out the latest edition of the Playful Math Carnival.
It’s a collection of awesome blog posts curated by John Golden and published on the Math Hombre website:
The whole point of the carnival is to show that math doesn’t have to be tedious or repetitive. Through a bunch of fun and engaging posts, we celebrate math that’s playful, creative, and totally relevant to everyday life.
Because what could be more relevant than having fun while we learn?
In this edition, you’ll find everything from math puzzles and games to humor and much more — so many people creating great math content.
If you want to mix up your math teaching and make it more enjoyable for your students (and for yourself), definitely check out the Playful Math Carnival.
Happy reading!
There’s a new math journaling prompt this week.
Have your kids tried it yet?
This week’s prompt features one of my explain-your-reasoning to get kids thinking (and writing) about math while avoiding the formality that turns so many students away from geometry proofs. Or you might prefer last week’s prompt, featuring a classic math brainteaser and encouraging students to create their own related puzzles.
Or, if you’re reading this post later and missed those, there’s another great new prompt this week for you to explore.
Check it out:
There’s a new Math Game Monday this week.
Have your kids tried it yet?
This week’s game is one of my favorites for upper-elementary and middle school students, offering plenty of practice doing estimation and mental math with fractions. Or you might prefer last week’s game, featuring a classic two-player logic puzzle that develops strategic reasoning.
Or, if you’re reading this post later and missed those, there’s another great new game this week for you to play.
Check it out:
The question came up on a homeschool math forum:
“My first grader and I were playing with equivalent expressions. We were trying to see how many ways we could write the value ‘3.’
“He wrote down 10 – 2 × 3 + 1.
“When I tried to explain the problem with his calculation, he got frustrated and didn’t want to do math.
“How can I help him understand order of operations?”
[If you think this sounds like too complex of a math expression for a first grader, you may want to read my blog post about math manipulatives and big ideas.]
Order of operations doesn’t matter in this instance. What matters is communication.
The mother didn’t know how to read what her son wrote.
He could help her understand by putting parentheses around the part he wanted her to read first.
He doesn’t need to know abstract rules for arbitrary calculations, or all the different ways we might possibly misunderstand each other. He just needs to know how to say what is in his mind.
I’ve been getting questions about my Math Journaling Adventures books:
“I’m so excited to try math journaling! We bought your Logbook Alpha, and my 11-year-old math-averse son is trying to be a math rebel at every turn.
“But I feel uncomfortable with the idea of rebellion. Doesn’t he need to learn how to solve math problems the right way?”
One of my favorite things about math is that there really is no “right” way to solve math problems.
As I pointed out in my ongoing Mental Math series, even a problem as basic as 6+8 can be approached from many directions. So perhaps I should say, the “right” way is however the student wants to make sense of the problem.
In math, sense-making and reasoning are always the most important things.
Over the course of this series, we’ve seen how mental math relies on a child’s own creative ways of thinking. In mental math, children develop understanding of how numbers interact with each other in many ways.
In this way, they learn the true 3R’s of math: to Recognize and Reason about the Relationships between numbers.
And the principles that underlie mental calculation are also fundamental to algebra, so that flexibility and confidence in mental math is one of the best predictors of success in high school math and beyond.
But as we went through the various example problems, did you find the written-out calculations hard to follow?
Don’t force your children to write down their mental math. It looks dreary when I write the calculations out step by step, but that’s not how it works in a child’s mind. With regular practice, this sort of thinking becomes second nature.
Ever since the school year started, I’ve been getting questions about how to use my new Math Journaling Adventures logbooks.
[SIDE NOTE: These logbooks are included in this month’s Thanksgiving Sale! You’ll get an automatic 10% discount off all print books, applied at checkout, no special code required.]
“I love the way your math books get my children thinking.
“Finally, they are having fun with math!
“But sometimes I have no idea what the journaling prompt is all about or how to teach it. Where can I buy a solutions manual?”
Um, that’s not how math journals work.
The cool thing about journaling prompts is that they have no “right” answer. They are explorations into different parts of the world of math, nature walks in the land of numbers, shapes, and patterns. Springboards into whatever our children want to investigate, whatever sparks their interest.
A few of the problem-solving prompts may have specific answers, but it really doesn’t matter if our kids find the exact solution a math professional might give. If they write what makes sense to them, they’ve accomplished the goal.
If later, they think of something they hadn’t noticed, or they want to change their answer — well, that is mathematical thinking, too.
Denise Gaskins' Let's Play Math 