How to Become a Lightning Calculator is a mental arithmetic book written by unknown author which provides techniques to quickly process common mathematical calculations.

1. Instantaneous Addition.
2. How to Add Two Columns at Once.
3. Multiplication.
4. Accurate Interest.
5. Equation of Payments.
6. The Lightning Calculator’s Addition.
7. Bank Discount.
8. How to Make Change.
9. Proof of Multiplication in Ten Seconds.
10. The Canadian Interest Rule.
11. Table of Transposed Numbers.
12. Short Method to Find the Interest of a Given Sum.
13. Interest Computations.

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