Showing posts with label number talks. Show all posts
Showing posts with label number talks. Show all posts

Monday, June 20, 2016

Number Talk Discussion #10

186 ÷ 6

There are a number of ways to approach this problem. Before we look at them, let's define each term of the division problem. 
186 is the dividend, or the number to be divided by another number.
6 is the divisor, or the number you divide by.
The answer to the problem (31 in our case) is called the quotient.


Multiply Instead
"I know 6 times 30 is 180, plus one more 6 gives me 186; so my answer is 31."

Expanded Form (Chunk it Out)

Make a Tower

Halving and Halving

Which of these methods work better for this problem than others? Did you try any methods not listed here? Share in the comments below!

Friday, June 17, 2016

Monday, June 13, 2016

Number Talk Discussion #9

146 + 197

Round and Adjust

Take and Give

Start from the Left

Break one Addend Apart

Add Up


Did you try a different method? Are some methods more efficient for this problem than others? Share in the comments below!

Friday, June 10, 2016

Monday, May 30, 2016

Number Talk Discussion #8

43 + 9

There are a number of ways to approach this problem. Before we look at them, let's define each term of the addition problem. 
43 and 9 are both called addends.
The answer to the problem (52 in our case) is called the sum.

Round and Adjust

Take and Give

Start From the Left

Break One Addend Apart

Add Up

Did you try a different method? Are some methods more efficient for this problem than others? Share in the comments below!

Friday, May 27, 2016

Monday, May 23, 2016

Number Talk Discussion #7

25 x 16

Break a Factor into Two or More Addends


Factor a Factor

Round a Factor and Adjust

Halving and Doubling

Connecting Arithmetic and Algebra





Did you use a different method to solve this problem? Are some of these methods more or less efficient for this type of problem than others? Share in the comments!

Friday, May 20, 2016

Monday, May 16, 2016

Number Talk Discussion #6

14 x 12

There are a number of ways to approach this problem. Before we look at them, let's define each term of the multiplication problem. 
14 and 12 are both called factors.
The answer to the problem (168 in our case) is called the product.


Break a Factor into Two or More Addends

Factor a Factor

Round a Factor and Adjust

Halving and Doubling

Connecting Arithmetic and Algebra






Did you use a different method to solve this problem? Are some of these methods more or less efficient for this type of problem than others? Share in the comments!

Friday, May 13, 2016

Friday Number Talk #6

Solve the following problem in two ways.

14 x 12

Share your methods in the comments below!

Monday, May 9, 2016

Number Talk Discussion #5

247 - 98

Round the Subtrahend to a Multiple of Ten and Adjust (Katie's method)

Decompose the Subtrahend (a variation of Tommy's methods)

Add Instead

Same Difference

Break Apart by Place


Did you use a different method to solve this problem? Are some of these methods more or less efficient for this type of problem than others? Share in the comments!

Friday, May 6, 2016

Friday Number Talk #5

Solve the following problem in two different ways.

247 - 98

Share your methods in the comments below!

Monday, May 2, 2016

Number Talk Discussion #4

34 - 9


There are a number of ways to approach this problem. Before we look at them, let's define each term of the subtraction problem. 
34 is the minuend. The minuend is the first number in a subtraction problem. The number from which another number is to be subtracted. 
9 is the subtrahend. The subtrahend is the number that is to be subtracted. The second number in a subtraction problem.
The answer to the problem (25 in our case) is called the difference.

Round the Subtrahend to a Multiple of Ten and Adjust

Decompose the Subtrahend

Add Instead
 

Same Difference


Break Apart by Place


Did you use a different method to solve this problem? Share in the comments!

Friday, April 29, 2016

Friday Number Talk #4


Solve the following problem using two different methods.


34 - 9

Share your methods in the comments below.

Monday, April 25, 2016

Number Talk Discussion #3



There are multiple ways to see the nine blocks in this figure. Below are a few of those ways:


Did you see 9 in a different way? Share below in the comments!

This Friday, I'll show you a different way to approach Number Talks using actual numbers, so be sure to join me for that!

Friday, April 22, 2016

Friday Number Talk #3


Without counting one by one, figure out how many boxes there are.



Share your method in the comments below.

Monday, April 18, 2016

Number Talks Discussion #2



This is an image of a Ten Frame. These are becoming more commonly used in the lower elementary grades to help students learn how to subitize (the ability to quickly identify the number of items in a small set without counting), gain number sense, and learn about place value.

Once students become familiar with Ten Frames, they can see that this particular image shows "2 less than 10," or "5+3," or "6+2." All of these are different ways to say "8."

Did you see "8" in a different way? Share your thoughts in the comments below!

Friday, April 15, 2016

Friday Number Talk #2


Without counting one by one, figure out how many dots there are.






Share your method in the comments below.

Tuesday, March 1, 2016

Making Number Talks Matter

I've just finished reading a great book called Making Number Talks Matter by Cathy Humpreys and Ruth Parker. Number Talks (or Math Talks) might not be new to you, but just in case they are: A number talk is "a short, fifteen-minute daily routine, in which students... mentally solve computation problems and talk about their strategies."

I know that 15 minutes is not actually a short amount of time in a classroom setting, and that for those of us who only see our students for 55 minutes a day, those 15 minutes are precious. But hear me out before you decide this isn't going to be a helpful part of your daily routine.

Raise your hand if you've ever bemoaned your students' lack of mathematical understanding. Raise your hand if you've ever wondered what your students have been doing in math class all those years before they got to you. Raise your hand if you've ever heard "You have to put the bigger number on top when you subtract." Raise your hand if seeing your students use their fingers to do any type of math makes your blood boil while also making you sad. Raise your hand if your students freak out when fractions come onto the scene. Did any of these things make your hand go up? Well then... Let's look at number talks and see if they can help with these things.

The fact that this happens in so many classrooms across the country does not indicate a lack of good mathematics teachers, or a wealth of students who aren't "math people" (not a real thing, by the way), but a problem with how mathematics has been taught. We have been taught that using the procedures and rules correctly and quickly is math, without anyone trying to have that process make sense.

This is where Number Talks come in! Number Talks are all about students and their ways of thinking. Number Talks allow students to tackle a problem mentally, and explore the methods they used in order to solve it. This often leads them to discover certain mathematical properties, and allows them to see the logic and connections between different strategies. They become more willing to persevere when solving complex problems and become more confident when they realize that they have ideas worth listening to.

The previous post, with the dots, is an example of a Number Talk. No matter what grade you teach, using dot cards is a great way to start this routine with your students. There is no arithmetic to scare students off, and all they have to do is describe what they see! Now, I know that this has been a long post, and the book I recommended is also pretty long, so I've created a PowerPoint that works as a companion to the book. I recommend checking out the PowerPoint, and if you feel like it would be helpful, check out the book! It's filled with great transcripts of classroom number talks to give you an idea of what it looks like in action.

Making Number Talks Matter - The Four Basic Operations

Monday, February 29, 2016

Number Talks Discussion #1

Thank you all so much for your thoughtful responses to our first Number Talk! Before we get into what Number Talks are and how to implement them in your own classroom, I'd like to discuss the responses y'all gave. Just as a reminder, the instructions were to look at this image, and without counting one by one, figure out how may dots there were.




The responses y'all gave were excellent, and were similar to those students give when they first encounter Number Talks! They ranged from counting one by one, to recognizing the pattern from previous experiences, to coming up with strategies for how to see patterns within the larger figure. None of these responses are better or worse than another, and we will spend the rest of this blog examining each type of response to help you recognize the merits of each.

Some of our students will automatically count the dots one by one. If your students do this, encourage them to find another way to determine the number of dots.

Some people saw the vertical line of 3 dots, then added the remaining two to get a sum of 5. Others might have seen the vertical line of 3 dots, then added the remaining two. The ability to quickly identify the number of items in a small set without counting is called subitizing. Recognizing the pattern as being similar to that found on a dice or from other sources is memorized subitizing.



Other people saw the two lines of three cross, and either added 3+3 or multiplied 2x3. Then they realized that the middle dot was counted twice in this process, and subtracted it from the total to end up with 5.



One person noticed the square formed by the outside dots, then added the middle dot. This geometric way of seeing will come more naturally to some than others.



Because many of our students haven't ever been asked to go beyond the algorithm or been encouraged to question the memorized methods, it might take a while for them to feel comfortable visualizing things in a different way. This is ok. It's also important to have these commonly used methods mentioned so that students can make connections between their method and the standard algorithm.

I'm going to have a Number Talk every Friday, with the responses discussed on Monday. Thank you all for participating in our very first one!