How to Calculate Quickly

The Plan of This Book ADDITION Addition in General "Adding Single Columns by Pairs, starts on" "Adding Single Columns by Trios, starts on" "Mental Addition of Large Numbers, starts on" "Two-Column Addition, starts on" SUBTRACTION Subtraction in General "Left-to-Right Subtraction, starts on" MULTIPLICATION Multiplication in General "Factoring, starts on" "Direct Multiplication by Numbers Greater than 12, starts on" "Multiplying Three Figures by One, starts on" "Multiplying Two Figures by Two, starts on" "Multiplying Three Figures by Two, starts on" "Multiplying Three Figures by Three, starts on" DIVISION Division in General "Direct Division by Numbers Greater than 12, starts on" "Mental Division of Large Numbers, starts on" "Division by Three Figures, starts on" "Division by Two Figures, starts on" FRACTIONS Fractions in General "Addition and Subtractions of Fractions, starts on" DECIMALS Decimals in General "Decimal Equivalents of Fractions, starts on" SHORT CUTS Horizontal Addition Combined Addition and Subtraction Multiplying by a Near Number Aliquot Parts in Multiplication Simplifying the Multiplier Multiplication by Factoring Factors between 11 and 19 Multiplying by 11 "Multiplying by 21, 31, 41, etc." "Squares of Numbers, starts on" "Multiplying When Corresponding Orders Are Alike, starts on" Multiplying a Sum by a Difference "Multiplications Involving Fractions, starts on" Aliquot Parts in Division Cubes of Numbers Algebraic Multiplication Table of Prime and Composite Numbers ANSWERS