Contents

Calculating from Left to Right

Addition from Left to Right

Writing Left to Right Calculations

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

3. By One More than the One Before

Squaring Numbers That End in 5

Multiplying Numbers Whose First Figures are the Same and Whose Last Figures Add Up to 10, 100 etc.

4. The First by the First and the Last by the Last

Check 1: The First by the First

Check 2: The Last by the Last

Check 3: The Digit Sum Check

Multiplying Numbers Whose Last Figures are the Same and Whose First Figures Add up to 10

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

6. Vertically and Crosswise (Part 1)

General Multiplication

Using the Vinculum

6. Vertically and Crosswise (Part 2)

Multiplying 2-Figure Numbers

Multiplying 3-Figure Numbers

Moving Multipler

3 and 4-Figure Multiplications

General Squaring

Division: Divisor near a Base

General Division

Practise

7. Using the Average

Products using an Average

Practise

8. By Addition and Subtratcion

Squares from Squares

Products from Products

Practise

9. By Mere Obversation

Use of Sepcial Numbers

Practise