Party Trick: Mental Multiplication

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“What did you learn today?” I asked M, my nearly-8-year-old, as part of our bedtime snuggle-and-connect.
“What did I learn today? Did I learn anything today?” M mused. “Oh! Riley asked me what is 169 times 28. It’s 4,732!”
“How did you figure that out?”
“Well, I know that anything times 10 just puts a 0 at the end. So 169 x 10 = 1,690. And that two times is 3,380. Plus another 1,690 is 5,070. Then I did 169 x 2, which is, um…”
“You kind of did it already with 1,690.”
“Right! 338! And 5070 – 338 is 4,732. Obviously.”
“Obviously.”
“Riley didn’t even know the answer! But I do know it now.”

And this is what bedtime looks like around here.

Sadia (rhymes with Nadia) has been coordinating How Do You Do It? since late 2012. She is the divorced mother of 7-year-old monozygotic twins, M and J. She lives with them and their 3 cats in the Austin, TX suburbs and works full time as a business analyst. She retired her personal blog, Double the Fun, but now also blogs at Adoption.com and Multicultural Mothering.

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Sadia

Sadia (rhymes with Nadia) has been coordinating How Do You Do It? since late 2012. She is the divorced mother of 10-year-old monozygotic twins, M and J. They live in the Austin, TX suburbs, where Sadia works full time in information technology. She contributes to a number of parenting websites and magazines and also runs The Mommy Blogging Guide, where she answers mommy bloggers' technical questions.

3 thoughts on “Party Trick: Mental Multiplication”

    1. I get off easy on the homework front. The most help my kids ever need is my lifting our enormous Spanish-English dictionary off the bookshelf!

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