Mental Math - Adding or Subtracting 10 First

Here's another way to do math in your head! This is my 6 year old's preferred method. She even came up with it on her own! Look through all my mental math videos, try out all the methods, and decide what your favorite is!

If you are teaching mental math to children, give them many problems of one type until they become proficient in that particular way of mental math. Then show them another way until they can do it in their heads - without manipulatives. Keep doing this until you have shown them all the methods or until they are quick enough with one method that they don't need others. Let them choose which method they prefer. None is better than any other.

Most children can be taught mental math strategies once they have their facts to 10 memorized - somewhere between Kindergarten and 2nd grade. Mental math is an excellent way to build and ensure number sense!

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Figure This Challenge #56

  • Complete Solution will be given on May 17, 2015

Complete Solution:



Created by Wanda Collins May 10, 2015 at 1:56pm. Last updated by Wanda Collins May 10, 2015.

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Fun Math Facts:

Math Limerick

Question: Why is this a mathematical limerick?

( (12 + 144 + 20 + 3 Sqrt[4]) / 7 ) + 5*11 = 92 + 0 .


A dozen, a gross, and a score,
plus three times the square root of four, divided by seven, plus five times eleven, is nine squared and not a bit more.

---Jon Saxton (math textbook author)

Presentation Suggestions:
Challenge students to invent their own math limerick!

The Math Behind the Fact:
It is fun to mix mathematics with poetry.


Su, Francis E., et al. "Math Limerick." Math Fun Facts.


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