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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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Links for July 20, 2008

July 20, 2008 @ 4:00 am | Filed under:

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Links for July 19, 2008

July 19, 2008 @ 6:03 am | Filed under:
  • Frustrated parents sneak ‘old math’ to kids – CNN.com – “They call it the Math Wars: The debate, at times acrimonious, over which way is best to teach kids math. In its most black-and-white form, it pits schools hoping to prepare kids for a new world against reluctant parents who feel that the traditional way is best and that their kids are being shortchanged.” (See comments for a link to a very interesting blog post on this topic.)
  • The Yale Law Journal – “Home Schooling” in California – Yale Law Journal report on CA homeschooling case: "The views expressed above are consistent with the amicus brief filed by the Department in the Rachel L. case on behalf of State Superintendent of Public Instruction Jack O’Connell."

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