Speed mathematics: secret skills for quick calculation

Multiplication: Part one

Using a reference number

Multiplying numbers above and below the reference number

Checking answers: Part one

Multiplication: Part two

Multiplying decimals

Multiplying using two reference numbers

Addition

Subtraction

Squaring numbers

Short division

Long division by factors

Standard long division

Direct division

Division by addition

Checking answers: Part two

Estimating square roots

Calculating square roots

Fun shortcuts

Adding and subtracting fractions

Multiplying and dividing fractions

Direct Multiplication

Estimating answers

Using what you have learned

Afterword

Appendix A. Frequently asked questions

Appendix B. Estimating cube roots

Appendix C. Checks for divisibility

Appendix D. Why our methods work

Appendix E. Casting out nines : Why it works

Appendix F. Squaring feet and inches

Appendix G. How do you get students to enjoy mathematics?

Appendix H. Solving problems.