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“New Math” and Logical Reasoning

by Sasha Fajerstein

posted by Sasha Fajerstein

Charlie has been accused of pulling the fire alarm on Friday, 12/5. Help him argue that he is innocent.

The facts:

  • The fire alarm was pulled in the student cafeteria at 11:55 am
  • Charlie has math period 5 with Ms. Smith
  • Charlie was in math class for the ENTIRE period on Friday, 12/5
  • 5th period starts at 11:45 and ends at 12:25

Prove Charlie did NOT pull the fire alarm.

The above is an opener that I give my geometry students when we start our unit on proofs. It may seem obvious that Charlie did not pull the fire alarm, but being able to come up with a string of statements that logically prove he did not pull the alarm is the same thinking process as reasoning through a mathematical proof. This type of thinking can be encouraged at a young age, and the more opportunity kids have to think this way, the more open minded they will be as students later on.

“New Math” has developed a pretty bad reputation over the last few years. Do a quick Google search of “new math” and you’ll find countless YouTube videos bashing it, sarcastic Instagram and Twitter posts demonstrating how confusing it is, and blog posts using “new math” to demonstrate how messed up our education system is. In fact, I received an email from a good friend this past school year titled “This is how they’re teaching math now?” with a forward from his son’s second grade teacher. The teacher had attached links to YouTube videos demonstrating how to do problems the way she was teaching them. Here is one of those links: At the end of the email, my friend wrote “This could not be any dumber. I showed him the proper way to figure it out.”

Many of you may be nodding your heads reading this because you’ve felt similar frustrations in trying to help your children with their math homework. You’ve thought to yourself “what was wrong with the way I learned how to do this?” But I want you to consider this: “New Math” is another name for “Reform Math” or “Inquiry-Based Math.” Inquiry-based math helps to develop the foundations of characteristics we all hope our future generation will hold. We want our kids to do things thoughtfully, with an emphasis on intent and process.

If you watch the video I linked above, you’ll see what looks like a complicated process for adding the number 96 and 48. In reality, the process is breaking down the following thought process: If I told you to add 96 and 48 without a pen and paper (so no “carrying” allowed!), you’d think “90 + 40 is 130, then I still need to add the 6 and the 8 so that’s 14 more… together that’s 144.” Inquiry based math helps kids develop methods and thought processes to do what many of us do mentally without the language to explain our thought processes. The image below represents the basis of inquiry-based learning – I like this specific image because it gives a short explanation of each of the inquiry steps.


Photo source:

In early math, students are not yet learning things like adding two digit numbers, but setting up a foundation of inquiry based learning and reasoning skills can be done at any time. In my high school math classes, the most successful students are those who are willing to approach a problem they don’t necessarily know how to do at first glance. The next time you are with your child at home, think about doing some of the following:

  • Encourage kids to solve problems in multiple ways. Instead of saying “It is too cold to go to the park, so we can either read a story or play a game,” you may want to try saying, “Hmmm, we were going to go to the park, but it’s too cold. What do you think we should do instead?” Oftentimes, as a teacher, I have to remind myself not to fall into the trap of only giving students a few clearly defined choices. While this is a great strategy for classroom management and behavioral expectations, meaningful thinking occurs more often when kids have the opportunity to come up with multiple solutions or conclusions.
  • When you are making a decision, try verbalizing your thought process as a model for your children. For example, while at the grocery store getting groceries for a dinner party, you could say “I had planned to make hamburgers for dinner, but Aunt Kelly is coming over for dinner and I just remembered that she doesn’t like hamburgers. I need to think of something that will make everyone happy. I will make lasagna instead.”
  • Encourage your children to make hypotheses and conclusions based on observations. If you burn a piece of toast while you are making breakfast, ask them why the toast burned and what you can do differently next time to make sure the toast is not burnt.
  • Give your kids “mysteries” to solve. For instance, ask them if they can come up with any ideas on why the music class might have started late or why the car in front of you is moving so slowly.

All of these activities build a strong math foundation in elementary school and beyond. While it may not seem like these activities involve any math, problem solving and the ability to create a chain of logical reasoning are skills that eventually translate to success in classes like Geometry, Calculus, and beyond.

15 Replies to ““New Math” and Logical Reasoning”

  1. It is easy to find fault with the \”new\” method since most of adults don\’t remember what it was like before we knew how to do mathematics. Taking time to have an elementary student explain the process will help adults understand and build confidence in the student.

  2. I think the opportunities are under-used in early math- and that reasoning in lots of different areas can translate to math reasoning.

  3. Trying to teach our children a new way to do things isn’t always easy especially when we think the way we learned is best. I really like your explanation of “new math.” I was not happy about it at first but when I took some time to really understand it, it made more sense. Your ideas to use in the classroom and at home are very helpful.

  4. I love how new math allows children to problem solve on their own terms instead of forcing them to go in one direction.

  5. Teaching children to reason using certain questions helps with their thinking in solving problems and math concepts

  6. My son is also learning this, “New Math”. He is in elementary school. I learned the old way so that is the way I had started to teach him. He would forget the steps or not know where to put the place values and get frustrated. I also was not a big fan of math, but in learning the new math it helped him understand it and me explain it better because we learn better visually.

  7. Very interesting…I really appreciate the way you described “new math”. I have been in that situation many times where i have to learn how the kids are doing the math these days in order to help them. It was very frustrating hearing at the beginning, “thats not how we are supposed to do it”. How else would you do it? I have a better understanding and more of an appreciation for this “new math”.

  8. I enjoyed reading this blog post because, as a parent when my children began to bring home their homework and I tried to help when they had questions in math, I was always told well this isn’t how the want us to solve the problem. It was a great time for me and my child to connect and for both of us to realize there is more than 1 correct way to solve a problem.

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