MATHEMATICS

Tampilkan postingan dengan label Measurement. Tampilkan semua postingan
Tampilkan postingan dengan label Measurement. Tampilkan semua postingan

Selasa, 08 Mei 2012

Counting and its applications

Counting, notwithstanding the, er, tale of Clever Hans, is so basic that it seems to be an innate ability in several animal species, according to an article published in Scientific American™ in September 2009.
[Clarification: the word ``basic'' above is being used in context as ``fundamental'', not ``simple''.  See tweet below linking to this blog post that missed the point.]

Parents teach their youngsters to count to 10, or children learn it on Sesame Street, and there are numerous studies showing babies can conceive of small numbers and preschoolers can judge greater or less than without knowing exact numbers, but by understanding approximate counts.

In mathematical parlance, the counting numbers are also called the ``natural'' numbers, as existing in nature.

So how is it possible to teach counting, the most natural of mathematical skills, unnaturally?  The worst way is to force memorization of numbers and number names before the concept is understood.  What kindergartner do you know that owns 90 of anything, except maybe for Beanie Babies?  Open a Scrabble set and look at the 100 tiles.  Is that a number of objects that a kindergartner needs to comprehend in their child's world?  Memorizing the names of numbers at the age of 5 before actually understanding the concept of the number is simply put, backwards.  Mathematics should not be taught that way.  A child should understand the number along with the name, before reading, and then writing the number.

If particularly anal parents want to push too-large numbers on their child at an early age for fear of falling behind, so be it, but the paranoia should not be systemic.

CCSSI standard K.CC.1 ``Count to 100...’’ carries into the next year's standard 1.NBT.1 ``Count to 120...’’ along with a few variations on the theme.  We won’t pause long to chide CCSSI for such arbitrary parameters because there is a much more compelling standard in the parallel Measurement and Data strand that pertains to counting, which creates the potential for some real advancement of thinking and analytical skills in early childhood.

Read more »

Sabtu, 15 Oktober 2011

Gazillions

Thinking up an activity for the Common Core State Standards.
  • 8.EE.3. Use numbers expressed in the form of a single digit times a whole-number power of 10 to estimate very large or very small quantities, and to express how many times as much one is than the other. For example, estimate the population of the United States as 3 times 108 and the population of the world as 7 times 109, and determine that the world population is more than 20 times larger. 
  • 8.EE.4. Perform operations with numbers expressed in scientific notation, including problems where both decimal and scientific notation are used. Use scientific notation and choose units of appropriate size for measurements of very large or very small quantities (e.g., use millimeters per year for seafloor spreading). Interpret scientific notation that has been generated by technology.
I've been thinking about this recently because I seriously impressed some school kids by multiplying in my head a couple of numbers in the billions. Then when Char Beckmann needed an activity for the  Adventures in Mathematics 8th grade book - opportunity! (Or rationalization...) (These books are from the Michigan Council of Teachers of Mathematics.)

My first couple of ideas were: something based on the brilliant scale of the universe applet, or a game looking at different representations of these numbers (my love for rummy games), or an activity based on Fermi problems.

Walking the kids to school this morning I was thinking about the rummy idea, and came up with a new game mechanic variation on rummy:  instead of collecting sets, each turn you have to play a card out in front of you. Then opponent can capture that card with a match. Then you could capture the pair with another matching card... kind of a slow run building mechanic.  Don't think it will fit for the book, but I will definitely try it in a game later.

Thinking about the matching puzzle, we have:




Number NamesMeasurement Prefixes Things
Power of Ten
One
Humans (meters)10^0
Ten
deca-
Orcas, Anacondas (meters)10^1
Hundred
hecto-
Redwood (meters)10^2
Thousand kilo- Mountains' height (meters),
Number of visible stars
10^3,
10*10*10
Million mega- Width of USA (meters)10^6
Billion giga- Diameter of the Sun (meters),
Age of the universe (years)
10^9
Trillion tera- Diameter of the Solar System (meters),
US national debt (dollars)
10^12
Quadrillion
peta-
One light year (meters)10^15
Quintillion exa-Number of grains of sand on earth10^18
Sextillion zetta- Diameter of the Milky Way,
Number of water molecules in a drop
10^21
Septillion
yotta-
Diameter of the Universe (meters),
Number of stars in the universe
10^24
Octillion
hella-
(petitioned)
Diameter of Universe (mm)
Mass of the earth (grams)
10^27
Nonillion
Number of bacteria on earth10^30
Decillion
Mass of the sun (grams)10^33


Number of atoms in the universe,
Volume of the observable universe (m^3)
10^80
Googol 
Possible volume of whole universe (m^3)10^100
Centillion

10^303
Googolplex

10^10^100


Why aren't millions called unillions? Or just an Illion? Mil- means 1000! I've always thought it must be because it should be 1000 thousands. Would numbers be more comprehensible without the -illions? The US national debt is 15 thousand thousand thousand thousands!

In grad school we proposed (probably it was Richard) a number system where there would be big numbers (since everyone knows what a big number is), and then a really big number would be a number that the number of digits was a big number. A really, really big number, then, is a number whose number of digits has a big number of digits. Quite sensible.


So the activity for the book could be matching quantities in different columns, though that doesn't give any opportunities for computation. Maybe a bit of a matching puzzle with some clues that require computation and comparison.

I cut things out of my table until it felt a little challenging, with enough structure to serve as an example for deduction and learning. I then put together some clues to help students fill in most, but leave a few for research, deduction or guessing.
The chart on the next page needs to be completed. The researcher has the data to fill in but no idea where to put it. Solve the puzzle of where to put the extra information. There are some blanks in the table, and those are shaded in. However some of the open spaces must get two comparisons, because there are too many for just one in each open space. 

Unfortunately, these are NOT in order. 
Names to fill in: Trillion, Quintillion, Centillion, Decillion, Octillion, Nonillion, Quadrillion, and Googol. 

Prefixes to fill in: yotta, hecto, peta, zetta, mega, and tera. 

Comparisons to fill in: Possible volume of whole universe (m3), Age of the universe (years), Mountains' height (meters), Width of USA (meters), Anacondas, Diameter of observable universe (mm), Mass of the earth (grams), Number of water molecules in a drop, One light year (meters), Number of bacteria on earth, Number of grains of sand on earth, Diameter of the Solar System (meters), Number of stars in the universe, and Redwood Trees’ height (meters) 

There were some weird facts the researcher remembered – maybe it will help you fill in the missing information! 
1. A googolplex has a googol zeroes. 
2. Thinking about word connections like tricycle and quadrilateral might help. 
3. The researcher remembers thinking that the number of grains of sand was exallent. 
4. Number of bacteria on earth is so big that there is about a sextillion for each human. (And there’s billions of humans!) 
5. A weird science measure is a mole. One mole of water is about 18 g, and has about 602 sextillion atoms. 
6. It would take about a million earths to have the same mass as the sun, even though the sun is made out of hydrogen and helium, mostly. 
7. It’s about 2000 km from Michigan to Florida. 
8. An average grain of sand is about 1mm wide. If you made a line out of all the sand on earth it would stretch for a light year! (The distance light can travel in a year.) 
9. The biggest official distance measurement is a yottameter, which is a billion times bigger than a petameter. 
10. In computers, a terabyte (TB) is 1000 GB, and a gigabyte is 1000 MB.



My favorite scientific notation/order of magnitude problems are Fermi problems, so I did put in a few of these for extensions.

Extensions
The brilliant physicist Enrico Fermi used to love posing crazy questions to his students and colleagues, so that now sometimes people call crazy estimation questions ‘Fermi Problems’ in his honor.

For example, he’d ask how many piano tuners there are in Chicago. He’d make a guess as to how many people, how many pianos, how many times they needed tuning and how many pianos one tuner could tune.

Try these Fermi problems and then make up your own! A tip is to think mostly about the powers of ten.
1. How many jars of peanut butter to fill up the Empire State Building?
2. How many photographs are in all the houses in your town?
3. How many middle schools are there be in the United States?
4. How many songs are downloaded in Michigan each day? 

Dr. Fermi said if you make enough guesses, some are over and some are under, and you would be surprised how accurate you might end up!

Jumat, 22 Oktober 2010

Unit Rummy and Game Design

The math game is at the end of the post - feel free to skip the rambling!

Adapting Games
This post actually started as I was thinking about my middle school bible study (online at ghbiblestudy.blogspot.com) and trying to think about a game that fits this week's study on Lazarus and the Poor Man.  An hour seems to be a bit long for my students to engage in bible study, at least for now.  (I haven't helped them build that capacity.  Yet.)  One of my favorite games occurred to me: The Great Dalmuti by Richard Garfield.  (Currently in print... so buy it!  Funagaingames.com is a great online game store.)  It's actually an adaptation of a family of games that have been played for many years.  So I was looking for the rules for playing with a regulation deck, so that my students could play at home.  (It also got me thinking about making a version of the game with Monopoly money... more on that later!)  Richard's version uses a pyramid deck, with one 1, two 2's, etc., that helps gameplay but is hard to simulate with a regulation deck.

Ed Yourdon @ Flickr
In looking for the rules, I stumbled across an online archive of Richard's game design articles from The Duelist, which was the print magazine dedicated to one of Richard's other games: Lost in the Shuffle: Dalmuti  This article is about how games could be as big as movies.  Is that what's finally happening with the gamification of the internet?  (Note that Richard's current thoughts on game design, along with those of several other designers, are there to hear at gameswithgarfield.com)

I sort of think the fourth year of HS math (for non-STEM majors, at least) should be a game playing course with Go, chess, hearts, bridge or Euchre, rummy, and Magic.  (Maybe Minecraft... I'm investigating.)  What else would you add?

The version of Dalmuti I wound up with for my youth group is below.  No specific math content, but problem solving and strategy is strongly helpful.  Maybe a good setting for probability dilemmas.


Ruler and Peasant


The Math Game Part
gail m tang @ Flickr

One of my favorite games to adapt is Rummy. (Rules here at Pagat, good resource for card game rules.)  It's a game about connections, seeing the cards in your hand in relation to each other and the cards in the discard pile, those relationships and then what your opponents have.  There's deduction and induction as you assemble pieces of information from what people play, discard and pick up versus the hidden information in their hand.  How much more mathematical can you get?

Units of measurement is one place where many preservice teachers feel underprepared, especially with respect to metric measurement units.  As we work in my K-8 geometry/measurement class on units, we use cards with a variety of units.  For them I have on some weird ones (drams, furlongs, hectares) to help them think about the process of learning these units.  We sort them by quantity that they measure, pair them as equivalent amounts, think of things to measure with the unit, and arrange them by relative size of the unit.  We play Concentration (aka Memory) with the equivalent pairs.  But the most fun, clearly, is playing Unit Rummy!

Unit Rummy
Deck: All unit cards. Players: 2 to 5

Deal: Shuffle all cards together. Deal 5 cards to each player. Flip over one card to start the discard pile. Place the stockpile and the discard pile card in the center of the table, where all players can get to them.

Object: To have the most played cards by the time someone goes out.

Course of play: After the deal, all players receive time to organize their cards. The person on the dealer’s left goes first, continuing clockwise.  A player may start his turn by drawing a card from the pile or picking up discards, going as far back into the discard pile as he wants. If a player goes back to a certain card, he must immediately play that card in a meld. (see “The Melds” below). You can’t discard this card. He may play any melds he wants to. It is not required to play a meld. A player must always end their turn by discarding a card (their choice). Lay the discards down in a way so each card is visible.

The hand is over when a player has no cards.  

Optional Scoring: Score one point for each card in play, and subtract one point for each card in hand. The player who goes out gets 3 bonus points.

Calling “Rummy”: If a player discards a card that may be laid off on other cards, the first player to notice it calls “Rummy” and plays the card for his benefit. A card counts a discard once a player takes his hand off it. Once the next player draws or picks up a card it is too late to rummy.

The Melds: a meld is a set of three or more matching cards. Cards match if they are equivalent measures or all use the same unit. For example 1 c = 8 fl oz = .25 quart for equivalent measures, or 1 ft, 1000 ft, .1 ft for all the same unit. On your turn, you can play a card that matches another player’s meld.

Cards
Instead of the weird units I have them sort and reason with, we play this game with a more elementary set of units.  (Email me if you want the college version with the weird units.)


Unit Cards (Elementary)

Jumat, 04 Desember 2009

Why Pi?

Quick book review.

Why Pi? is a DK picture book/encylcopedia by Johnny Ball. The author sounds as if he was the Mr. Wizard of Great Britain in the 70s, and is the author of many books, several of which are math and science related. But this is my first of his.

Xavier (9) says: it's really good. I bow to whoever suggested it. It was fun and funny.

Ysabela (10) says: it's kind of funny, but in an interesting way. It's got a lot of information, but is definitely enjoyable reading. And it has Egyptians, awesome.

John (45) says: the book was unexpectedly thorough. It has a lot of excellent math and science history, from several ancient cultures, and deeply explores the concept of measurement as it pertains to many topics. It is a great read, and a solid reference. Despite this exposure coming from the library, I will be looking to purchase it. As the kids have pointed out, it is long on humor, and deep in breadth. (Both difficult quantities to measure.)

Selasa, 07 Juli 2009

Michigan Smith

This is a fun game that I've used 2nd-4th grade and at a family math night with some older kids. Also with my preservice teachers, of course. It practices measurement technique and familiarity with cm, as well as sneaking in some geometry about efficient paths and distances. There's not a lot of strategy, but there is some. The downside to the game is needing a new sheet each time you play - unless you laminate, of course.

The name Michigan Smith is my takeoff on Indiana Jones. This would be an easy game to dress up, or have kids make their own variation. The Gauntlet of Power picture is from the Magic the Gathering card of the same name, and is tm Wizards of the Coast.

The pdf is here at my faculty website. As an image it's below. Comments and feedback are always welcome.