https://www.amazon.co.uk/Mathemagics-Genius-without-Really-T...
This is awesome book, it teach you all sort of tricks from 3 digits addition to 3 digits multiplication.
I know its written for school teens, but still pretty helpful life skills.
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https://www.amazon.co.uk/Mathemagics-Genius-without-Really-T...
This is awesome book, it teach you all sort of tricks from 3 digits addition to 3 digits multiplication.
I know its written for school teens, but still pretty helpful life skills.