Fun math trick: multiply with lines

August 26, 2020 @ 7:57 am | Filed under: , , ,

Yesterday I happened upon a TikTok video that demonstrates a very cool method for solving multiplication problems.

@mathswithmisschangWho uses Japanese multiplication?! 🤩 ##maths ##easymaths ##fyp ##foryoupage ##learnontiktok ##school ##gcse ##teacher ##multiplication♬ ROCKSTAR – DaBaby, Roddy Ricch

I couldn’t wait to share it with the kids. They were fascinated and turned the front porch into a giant chalkboard for practice sessions.

Huck and Rilla doing math with chalk on the front porch

In this video, Miss Chang shows how carrying works:

@mathswithmisschangJapanese multiplication part 2 EXPLAINED with carrying over! 😝 ##maths ##easymaths ##learnontiktok ##fyp ##foryoupage ##school ##gcse♬ Backyard Boy – Claire Rosinkranz

This Youtube video walks through a few more problems, including some with three-digit numbers and carrying over. The method works with larger numbers but gets a bit unwieldy beyond three or four digits.

So cool!

 


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Comments

2 Reponses | Comments Feed
  1. Avatar

    sarah r hutchins says:

    So cool! Evelyn is running out to get the sidewalk chalk now! Combine this with Bubble Gum math, and you could take this show on the road!

  2. Avatar

    Kathryn says:

    One of my daughters was taught this method at school. Very clever!