AdditionAddition Shortcut # 1: Adding from the LeftAddition Shortcut # 2: Rounding upAddition Shortcut # 3: Fast Addition in StepsAddition Shortcut # 4: Fast Addition by ColumnsSubtractionSubtraction Shortcut # 1: Add the Distances From 100Subtraction Shortcut # 2: Alter Both Sides to SimplifySubtraction Shortcut # 3: Convert to Two StepsLogical RulesMultiplication ShortcutsMultiplication Shortcut # 1: Squaring NumbersMultiplication Shortcut # 2: Dropping the ZeroesMultiplication Shortcut # 3: Multiplying by 4Multiplication Shortcut # 4: Multiplying by 5Multiplication Shortcut # 5: Multiplying by 11 or 12Multiplication Shortcut # 6: Multiplying by 9Multiplication Shortcut # 7: Multiplying by 15Multiplication Shortcut # 8: Multiplying Two Numbers 2 or 4 Digits ApartDivision ShortcutsDivision Shortcut # 1: Fast Division by 4Division Shortcut # 2: Fast Division by 5 or 25