The Natural Calculator

Contents

 

Front Cover

Book Details

Introduction

1. On the Flag

Calculating from Left to Right
Addition from Left to Right
Writing Left to Right Calculations

Practise

2. Proportionally

Multiplication by 4, 8, 16, 20, 40 etc
Number Splitting
Extending The Multiplication Tables
Multiplication by 5, 50, 25 etc
Multiplication by Numbers that End in 5, 25, 75

Practise

Practise

Practise

5. All from 9 and the Last from 10

Numbers Just Below a Base
Subtraction
Numbers Above a Base
One Number Above and One Number Below the Base
Proportionally
Numbers Near Different Bases
Multiplying 3 Numbers Simultaneously
Squaring Numbers Near a Base
Squaring Numbers Near 50
Multiplication by 9's
Addition
Subtraction
Writing Addition and Subtraction Sums

Practise

6. Vertically and Crosswise (Part 1)

General Multiplication
Using the Vinculum

Practise

Algebraic Proofs

References

Back Cover

 

English Chinese (Traditional) Dutch Finnish French German Hindi Korean Russian Ukrainian