Reflections and Resources from Tarheelstate Teacher: December 2015
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What's My Error? Extraordinary Math Hack

Are your 4th or 5th grade students learning the array/area model for multiplication and continuing to make common errors? Mine were having some trouble, until I started asking them to "find my error." Today's math hack is so simple, you can have it ready in 5 minutes--and you can use it for just about any concept you are teaching in math.
Are your 4th or 5th grade students learning the area model for multiplication and continuing to make common errors? Mine were having some trouble, until I started asking them to "find my error." Today's math hack is so simple, you can have it ready in 5 minutes--and you can use it for just about any concept you are teaching in math. Learn how I use error analysis to help students understand math models better and solve problems with more accuracy.


I have fallen in love with using Error Analysis with my 4th graders. 4th grade math content can be such a beast as students are required to master larger multiplication, division, and fraction concepts. Plus, they need to master their multiplication facts and become more accurate with all of their computation because almost everything requires multiple steps. In comes error analysis where students examine problems that have been completed with common errors. Students identify where the error was made and discuss what aspect of the concept the person who solved the problem does not quite understand.
Are your 4th or 5th grade students learning the area model for multiplication and continuing to make common errors? Mine were having some trouble, until I started asking them to "find my error." Today's math hack is so simple, you can have it ready in 5 minutes--and you can use it for just about any concept you are teaching in math. Learn how I use error analysis to help students understand math models better and solve problems with more accuracy.

During second quarter, we focus on multiplication. I expect my students to master the area model and the standard algorithm. If you are unfamiliar with the area model for multiplication, here's two quick videos that you can watch to understand how it works:


While I was teaching the multiplication area model, I kept noticing common errors (either within one student's work or across the class in general). Of course, this made me wonder what I had done wrong in my teaching and how I could go about improving students' understanding and mastery of the method. I immediately thought of a way I could work with students' common errors by putting the mistakes on myself. I decided to use their common errors to help them focus on becoming more accurate. I wanted my students to learn to look at their work more objectively and to be able to help them revise any misunderstandings that they had internalized with their incorrect practice.

Are your 4th or 5th grade students learning the area model for multiplication and continuing to make common errors? Mine were having some trouble, until I started asking them to "find my error." Today's math hack is so simple, you can have it ready in 5 minutes--and you can use it for just about any concept you are teaching in math. Learn how I use error analysis to help students understand math models better and solve problems with more accuracy.I grabbed some index cards and students' homework and started looking for errors. I came up with a handful of different errors they had made and created 5-6 cards. At the start of math, I displayed cards on the board with my document camera and asked students to raise their hand when they found my error. After a few practice problems together, I returned students' homework and asked them to find their errors. I noticed a tremendous improvement in students' ability to find their errors and a greater focus on accuracy.

Now when students have an error on their paper, I say "Can you find your error? What's your error?" I love being able to call their mistakes an "error" and hope that they connect that word to the fun way I introduced it so that it's more like a game than a disappointment that their answer is not correct.

While we were identifying errors as a whole group, I realized that I would LOVE for students to work on identifying more errors made while using the area model to multiply and that task cards would be the perfect way to help every student practice and improve their own understanding of the area model. My "What's My Error?" task cards are now ready to go!!
Are your 4th or 5th grade students learning the area model for multiplication and continuing to make common errors? Mine were having some trouble, until I started asking them to "find my error." Today's math hack is so simple, you can have it ready in 5 minutes--and you can use it for just about any concept you are teaching in math. Learn how I use error analysis to help students understand math models better and solve problems with more accuracy.

Whether you are just now teaching students to multiply with the area model or have already taught your multiplication unit, these cards are perfect for spicing up your practice and review. My students actually love error analysis and were so engaged in trying to identify the error that had been made. I will even be pulling these cards out soon for my 5th graders to help them review whole number multiplication! I think "What's My Error?" will be a hit with them as a fun way to make sure they remember how to use the area model to multiply. You can easily create your own error analysis task cards by taking a look at your students' errors, but it's so nice to have these sets ready to go now.

Are your 4th or 5th grade students learning the area model for multiplication and continuing to make common errors? Mine were having some trouble, until I started asking them to "find my error." Today's math hack is so simple, you can have it ready in 5 minutes--and you can use it for just about any concept you are teaching in math. Learn how I use error analysis to help students understand math models better and solve problems with more accuracy.

I ended up creating 80 error analysis task cards on 5 levels, so you have a variety of problems and can differentiate easily. Each card contains only 1 error. I expect students to find the correct answer after identifying the mistake. I created 16 cards for each of the following:

2 digit by 1 digit
3 digit by 1 digit
4 digit by 1 digit
2 digit by 2 digit
3 digit by 2 digit

Each set is color coded so that you can keep them separate, but if you don't print in color, I suggest that you print each set on different colors of cardstock to keep them organized.

Are your 4th or 5th grade students learning the area model for multiplication and continuing to make common errors? Mine were having some trouble, until I started asking them to "find my error." Today's math hack is so simple, you can have it ready in 5 minutes--and you can use it for just about any concept you are teaching in math. Learn how I use error analysis to help students understand math models better and solve problems with more accuracy.
What common errors did I include in these task cards?

• Student’s partial product does not have enough zeros when multiplying multiples of 10

• Student records too many zeros when multiplying multiples of 10

• Student does not line up place values correctly when adding the partial products to find the solution

• Student makes a multiplication fact error

• Student does not yet understand what parts of the factors to multiply and therefore multiplies a factor within itself vs multiplying by the other factor parts

• Student flips numbers when recording them to add the partial products

• Student did not expand numbers correctly when recording the hundreds/tens/ones

Common Core Connection: 4.NBT.5: Multiply a whole number of up to four digits by a 1-digit whole number, and multiply two 2-digit numbers, using strategies based on place value, the properties of operations, illustrate and explain the calculation by using equations, rectangular arrays, and/or area models.

Thanks for stopping by and I hope you can put this Math Hack to use!

I'm linking up again with Rainbow City Learning and my Teacher Talk friends for the December edition of Teacher Talk. Follow the links to find other great ideas!


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