Mental Math Methods - My most valuable resource!

[SSerenity]

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https://itunes.apple.com/us/podcast/mental-math-secrets-your-secret/id372386413

These videos are absolutely amazing.

Good luck.

 

[mehc012]

I'm disappointed that it doesn't explain the why behind all of the tricks, but they're good tools!

PS Aaaagh but they use the wrong complement and it makes me sad 🙁