Monday Math: Today’s Prizes are two cool science experiments

Posted by MomOnMars on August 29, 2011

Welcome to Twyla’s Corner, where each Monday, I post a question from the Blue Filing Box of math problems. The first person with the correct answer wins. Today’s prize comes courtesy of Steve Spangler Science and includes two very cool DIY science experiments: 10 grams of Insta-Snow Powder and a small bag of Jelly Marbles.

Hello, how are you?

If there are 20 people in a gathering and they all shake hands with each other, how many handshakes are there?

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  • http://www.jenniferjonesperry.com jenn p.

    380? :)

    • MomOnMars

      Nope. But it’s a good try. Anybody else want to have a go at it?

      • Kim

        I got it! I’ll def. Be back for Monday Math again!

        • MomOnMars

          Work that brain, girl!

  • D. cruz

    Is the answer 10??

  • Jenni

    400

  • http://sensiblysara.wordpress.com/ Sara Phillips

    190?

    • MomOnMars

      Sara – you’ve got it! Want to share how you came up with your solution?

      • http://sensiblysara.wordpress.com/ Sara Phillips

        I’d have to get my husband to explain that to you! Something about the first guy shakes hands with 19 people, the 2nd guy shakes hands with 18 and so on … (Math was NEVER my strong subject!!)

  • Vicki

    400

  • http://twirlreviews.com twirl

    A lot? :D I win.