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## Mental Math Tricks

Amaze and delight others as you multiply, divide, and square at lightning fast speed. Learn and practice the tricks of mental math calculation in a fun and engaging application. Study any of the tricks and then practice them as you progress through various levels of proficiency. Tease your brain with a quick practice session while waiting in lines, riding in the car, or on the plane. Only the basic math skills of addition, subtraction and simple multiplication and division are needed to achieve astonishing results.

Students: Baffle your teachers by providing answers faster than thought possible.

Teachers: Inspire your students as you pull answers out of thin air.

Master these incredible tricks:

• Multiply as high as 20 x 20
• Square numbers ending in 5
• Square any two digit number
• Square numbers from 41 to 59
• Square numbers in the 50's
• Doubling and Halving
• Quickly multiply by 4
• Quickly multiply by 5
• Quickly multiply by 9
• Quickly multiply by 11
• Quickly multiply by 25
• Quickly multiply by 99
• Multiply numbers in the 90's
• Round number multiplication
• Quickly divide by 5
• Quickly multiply numbers differing by 2, 4 or 6
• Quickly multiply numbers whose one's place adds to 10
• Quickly multiply two close numbers
• Sum the first n even numbers
• Sum the first n odd numbers
• Large number addition #1
• Large number addition #2
• Large number subtraction
• Nines complement
• Tens complement
• Casting Out Nines Digit Sum
• Check Addition by Casting Nines
• Check Subtraction by Casting Nines
• Check Multiplication by Casting Nines
• Check Division by Casting Nines
• Casting Out Elevens Digit Sum
• Check Addition by Casting Elevens
• Check Subtraction by Casting Elevens
• Check Multiplication by Casting Elevens
• Check Division by Casting Elevens
• Evenly divisible by 3
• Evenly divisible by 4
• Evenly divisible by 5
• Evenly divisible by 6
• Evenly divisible by 7
• Evenly divisible by 8
• Evenly divisible by 9
• Evenly divisible by 10
• Evenly divisible by 11
• Evenly divisible by 12
• Square numbers in the 20's
• Square numbers in the 30's
• Square numbers in the 60's
• Square numbers in the 70's
• Square numbers in the 80's
• Square numbers in the 100's
• Square numbers in the 200's
• Square numbers in the 300's
• Square numbers in the 400's
• Square numbers in the 500's
• Square numbers in the 700's
• Square numbers in the 800's
• Square numbers in the 900's

Prepare for the SAT, PSAT, ACT, GRE, GMAT, MCAT, or any other standardized test. Don't waste time with a calculator on the few tests that allow them.

Perfect training for the UIL Mathematics and Number Sense Contests.

Activate and challenge your brain to expand its ability to think efficiently and have fun at the same time. Train yourself to break problems down in to smaller more manageable pieces in order to reach solutions quicker and more accurately than anyone else.