Help choosing a system for mental math

Wow! Just wow! Well done. And in a short amount of time.

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Thanks, Kinma. :slight_smile:

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You really can’t do better than get detailed advice from Kinma. IMO those posts are worth money!

Methods are part of a toolkit. With experience you learn to spot which problems are easiest done this way or that. Every method is useful though you will favor some. Each one takes time to learn.

I say, learnt the squares up to 100. Turns out it’s not that much work and it’s a real boon.