## Saturday, August 28, 2010

### Data Collection: Tossing Two Dice

Students LOVE working with dice, almost forgetting that they're doing math.  While standard probability lessons ask students to calculate the probability of tossing an even number, a sum of 10, etc., students are more highly motivated when they generate their own experimental data.

The Mathwire collection contains many examples of both one-die toss activities and two-dice toss activities.  These data investigations begin with a game but make data collection an integral part of the activity, so that students begin to examine the underlying probability of the game and can use appropriate strategies in future play.

Students will generate their own small set of data, which should be combined with the whole class data for a larger set.  Teachers may ask questions to help students draw conclusions and make generalizations about the probability of dice tosses.

After this initial hands-on data collection and analysis, extend the activity by asking students to use online dice simulators to generate even more data to test their hypotheses and generalizations.  This option allows students to quickly generate large sets of random data.  It is helpful to pair students for this activity:  one student at the computer keyboard and the other student recording the results of each simulated dice toss.  Again, ask students to post their results to a class data collection display (e.g. tally chart, graph, etc.) so that the class is able to analyze the larger sample.

Check out these online dice-toss simulators:
• Coins & Dice:  A Probability Simulator records the results of each dice toss, making it easy for students to record the result of each dice toss
• Dice Roll displays the results in a bar graph so that students visually see the results of extended dice tosses
This data collection and data anaylsis approach provides students with hands-on data collection activities that generate real-life data for analysis.  Students then take advantage of technology to simulate the activity, quickly collecting larger sets of random data.  It's the best of both worlds!

## Sunday, August 8, 2010

### Writing in Math Class

Teachers incorporate writing in math class to help students reflect on their learning, deepen their understanding of important concepts by explaining and providing examples of those concepts, and make important connections to real-life applications of the math they are learning. Teachers use the writing assignments to assess student understanding of important concepts, student proficiency in explaining and using those concepts and each student's attitude toward learning mathematics.

Writing in mathematics is a win-win for both teacher and student. Although it may be difficult to introduce this practice, it is well worth the effort. Look for simple ways to incorporate short writings throughout daily lessons and longer writings over the course of weeks or math units.

• Use whiteboards often throughout a lesson.  Ask students to define a term in their own words, explain why an answer is correct/incorrect, show their thinking using words, pictures, numbers, etc.  For some students, the "forgiveness" of an erasable whiteboard encourages them to write more.  For others, the color and novelty motivate active participation.
• Plan regular Think-Write-Pair-Share opportunities:  plan to stop instruction to include these student-controlled learning opportunities in which students are asked to think (nonverbally respond to a question or prompt), write their response, pair share their responses, then share responses with the class.  This strategy is particularly effective for shy or struggling students as they have time to practice their response on a peer, hear their partner's response, and finally combine responses to share with the class.  This practice also helps students make the connection between oral and written responses. Teachers may elect to chart responses in bullet format to post for student review.

## Sunday, August 1, 2010

### Three Strikes and You're Out!

Summer means baseball games so capitalize on this favorite sport with the game Three Strikes and You're Out!  The game was designed to practice addition and subtraction facts while incorporating a basic introduction to probability outcomes.

Players will enjoy choosing the numbers for their players and their strikes.   As they play the game, they'll learn which numbers are best for placing players and which numbers are best left as strikes, developing a basic understanding of probability.  They'll practice addition or subtraction facts while learning that the dice toss is often unpredictable and random.

The game uses the sum of two dice to practice addition facts, but may easily be adapted to practice subtraction facts by using two 12-sided dice and finding the difference. The game handouts include directions, variations in play and scoring, game boards for both the addition and subtraction games, as well as game pieces that may be used to support the baseball theme.