Secrets of Mental Math Main Points & Mental Math Techniques

Secrets of Mental Math
Main Points & Mental Math Techniques

Secrets of Mental Math

Main Points & Mental Math Techniques

1. Mental Addition & Subtraction

Use the left-to-right method and simplify large calculations into smaller, manageable parts.

2. Multiplication by 11

Learn a quick mental technique for multiplying two-digit numbers by 11.

3. Squaring Numbers

Special shortcuts make squaring numbers ending in 5 and numbers close to multiples of 10 much easier.

4. Special Multiplication Tricks

When numbers have the same first digit and their last digits add to 10, multiplication can be performed rapidly.

5. Mental Division

Use mental strategies to calculate quotients, including decimals and fractions.

6. Guesstimation

Estimate answers quickly when an exact calculation is unnecessary.

7. Practical Mathematics

Apply mental math to tips, sales tax, discounts, compound interest and everyday calculations.

8. Number Memory

Use mnemonic techniques, number-to-word conversion and memorable stories to remember long numbers.

9. Day-of-the-Week Calculation

Learn techniques for determining the day of the week for a given date.

10. Advanced Mental Math

Explore advanced multiplication, large-number squares, roots and mathematical magic.

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Key Principle: Simplify the problem, work systematically, and practise regularly.

Source: Secrets of Mental Math — Arthur Benjamin & Michael Shermer