## Book description

The Complete Idiot's Guide® to Speed Math provides easy-to-understand methods, tips, and tricks to do math in one's head, on paper, and on a calculator at a faster rate and with more accuracy for anyone who is intimidated by math and for whom such calculations would otherwise require paper or calculator.

1. Cover
2. Title Page
4. Introduction
5. Part 1: High-Speed Operations
1. 1 Multiplication
1. Finger Multiplication
2. Special Multiplication by 11
3. Below the Base Method
4. Above the Base Method
5. Above and Below the Base Method
6. Multiples and Submultiples
7. Combined Problems
8. General Multiplication Using the Vertically and Crosswise Method
2. Addition with Numbers Near 10 or a Multiple of 10
3. Number Splitting
3. 3 Subtraction
1. Left-to-Right Subtraction
2. Subtraction with Numbers Near 10 or a Multiple of 10
3. Number Splitting
4. Subtraction with the All from 9 and Last from 10 Method
4. 4 Division
1. Division with the Flag Method
2. Altered Remainders
1. What Are Digit Sums?
2. Casting Out Nines
3. The Nine-Point Circle
6. Part 2: High-Speed Math Applications
1. 6 Fractions
2. Subtracting Fractions
3. Multiplying Fractions
4. Dividing Fractions
2. 7 Decimals
1. The Decimal System and Place Value
3. Subtracting Decimal Numbers
4. Multiplying Decimal Numbers
5. Dividing Decimal Numbers
3. 8 Percentages
1. Converting Percentages into Fractions
2. Converting Fractions into Percentages
3. Converting Percentages into Decimals
4. Finding the Percentage of a Given Quantity
5. Expressing One Quantity as a Percentage of Another
6. Approximating Percentages
7. Percentage Increase or Decrease
4. 9 Divisibility
1. Divisibility Rules
2. The Osculation Method
5. 10 Squared Numbers
1. Finding Squares of Numbers Ending in 5
2. Finding Squares of Numbers Near 50
3. Using the Duplex to Find the Value of a Squared Number
4. Combined Operations: Sums of Squares
6. 11 Cubed Numbers
1. Finding the Cubes of Two-Digit Numbers
2. Calculating Cubes Near a Base
7. 12 Numbers to the Fourth and Fifth Powers
8. 13 Square and Cube Roots
7. Appendixes
1. A Practice Problems