Divide by 9
- Details
- Category: Miscellaneous Miscellaneous
- Published: 15 September 2008 15 September 2008
Another article on quick head calculations explains how to quiclky divide a number by 9.
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The rule of 70
- Details
- Category: Miscellaneous Miscellaneous
- Published: 15 September 2008 15 September 2008
An article on the old financial rule of 70. It explains how it works and introduces some new "rules" of my own:)
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Square Roots
- Details
- Category: Miscellaneous Miscellaneous
- Published: 15 September 2008 15 September 2008
How to calculate square roots in your head... no aspirin required.
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