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Did you know you can subtract left to right?

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Howie Hua

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180,915 次观看 • 2 年前 •via X (Twitter)

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8 条评论

Chris Natale 的头像
Chris Natale2 年前

Why not represent the sub-differences like so to preserve place value?

Eric Zaman 的头像
Eric Zaman2 年前

Great video. Thanks for sharing! I also appreciate the reference to James Tanton. He is truly inspirational for us math instructors. Love his thoughts on teaching trig.

Jessica Stabler 的头像
Jessica Stabler2 年前

I can subtract large numbers much more quickly in my head now! ❤️

Russ 🌏 🇺🇦 的头像
Russ 🌏 🇺🇦2 年前

I have questions for my old maths teacher. WHY DID YOU NEVER MENTION THIS?!

Lucy Storer 的头像
Lucy Storer2 年前

This makes so much more sense to me. I always subtract left to right mentally, so it’s good to see it written down like this.

Richard Cauche 的头像
Richard Cauche2 年前

Je le montrais aux 5e et ceux qui n'avaient pas trop de difficultés en calcul avec les relatifs l'utilisaient. Réinvestit les relatifs, développe le calcul mental, finies les retenues, ordres de grandeurs. Ils adoraient cela!

Apple for the Teacher 的头像
Apple for the Teacher2 年前

WHAT??? WHY didn’t anyone tell me this when I was a kid??? I LOVE this!! Thank you!! 🙌🤗💗

Fadhil 的头像
Fadhil2 年前

275

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