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
