# More Multiplication Mastery

Here’s another way to reinforce multiplication concepts with your elementary school kids. You just need a hundreds table and some markers. You can present it like a puzzle. Or you can be fancy and tell your kids that they’re going to make the  Sieve of Eratosthenes.  Yes, that will get their attention.

Here’s the quickie info:

1. Print this hundreds chart.
2. Get a handful of markers.
3. Tell your child that 1 is a special number and gets to be circled right from the start. Let her choose a color to circle it with.
4. Next tell your child that 2 is also a special number and gets to be circled. Choose any color. Isn’t this exciting?
5. Now tell your child to cross out any number in the chart that is a multiple of 2. Bye-bye even numbers! (Except for 2, which is circled.)
6. Next tell your child to circle 3, then cross out all the multiples of 3.
7. Now tell your child to circle 4…wait! You cannot circle 4 because it has already been crossed out (even number), so circle the next available number…5. Then cross out all multiples of 5.
8. Continue like this until all numbers in the hundreds table have either been circled or crossed out. There will be 26 circled numbers (25 prime numbers, and 1 – which is not prime.)

As you sit with your child, observe how he works. Slowly? Excitedly? Does the color of the marker and the precision of his circles and x’s matter to them? Have patience. (Get that cup of tea or coffee that’s always nice to have around when practicing patience.) Ask your child what she notices about the table. Ask your child what she wonders about the table. Observe what gets your child’s attention. Do not get frustrated if he loses attention. Try again another time.

(Mathematically…this activity reinforces multiplication facts without being directly about multiplication facts. As your child works through the table, she might be counting on from each number or adding to each number or actually multiplying each number. Whichever method he is using, he will be working on his facility with numerical manipulation. She will get visual reinforcement of her mental processes. He may notice patterns. She may notice numbers that get crossed out multiple times. In working through the table and observing the colorful work that is created, your child will create new connections to the work. And even though I’ve presented this as a way to reinforce multiplication facts,  it can also be a way to talk about prime numbers and algorithms.)

## 3 thoughts on “More Multiplication Mastery”

1. Another very useful post Pam. I will try this with my second grader. And I loved the way you used he and she alternately 🙂

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1. Ha! I’m glad you mentioned that…I was wondering if switching pronouns made sense or just sounded strange!

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1. 😊. In one of my posts I used
s/he when I was talking about an earthworm. So when I noticed this , I thought using it alternately was a good way of dealing with it.

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