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Mathemagics - Mental Math Tricks

Quick Mental Math Tricks

  • Android, iPad, iPhone
  • Free
  • age 7+

About Mathemagics - Mental Math Tricks

Mathemagics is a terrific app for learning speedy math tricks to speed up your written arithmetic and improve its accuracy.  This app is ideal for anybody keen to reduce their reliance on technology for calculations.

Teacher Review

Travel back in time a few decades and many of the maths tricks taught in this app were known by schoolchildren.  Lacking calculators, tricks to quickly perform arithmetic and to check answers were extremely useful.  It is sad that many of these are no longer taught, as many can give you the answer quicker than you could get them from a calculator or calculator app.  Now knowledge of them is not universal it is difficult to build them back in as teachers themselves have grown up without them, and often without knowing that they exist.

This app is the link between these clever and convenient maths tricks and the children of today.  It is absolutely crammed full of them.  Old favourites, such as Casting Out Nines are there to check answers, alongside multiplication, summing and squaring tricks to get answers quickly. 

As well as providing the instructions in clear and precise text, the app also offers both practice and challenge modes to develop the skills and then test them.  The different tricks that the app can teach are easy to browse through and access.  Many of them have names that make it clear what type of questions they help with, but some of the others you’ll need to tap on and have a quick look at their purpose.  By their nature some are quite specific in their use and others quite broad.

Knowing these tricks isn’t just about speeding up arithmetic and becoming more accurate at it, although that is a big part of it, they are also interesting in their own right as mathematical enquires.  How and why does the Casting Out Nines trick tell you that the answer is definitely incorrect but cannot tell you that it is definitely correct? Pick any of the other tricks, how and why do they work? 

Many of these do seem like magic, but for the mathematically curious student, or a class set the task of investigating them, breaking them down, applying algebra and studying them reveals that they are understandable.

These insights into the fascinating workings of arithmetic are encased in a minimalist and elegantly designed app that is a joy to browse through.  The tasks and practice sections are intuitive to work with and are well matched to the section that they are designed to help test.  The challenges do their jobs effectively, offering useful practice, as the multiple options for an answer are usually close enough that the player really does have to use a mathematical technique to work them out.  A choice of playing against the clock or without any restrictions is available to the player.

This app has something to offer parents, teachers, and children.  Learning something new for your own benefit and to teach to children will be a satisfying use of this app.  Building a lesson around learning and investigating one of these tricks will give teachers a novel and useful activity for their class.  Children can learn one or more as an impressive trick to show friends and teachers and develop independent learning skills as they do so. 

With its unique content and excellent presentation, this app will make a great addition to any tablet whose owner has an interest in maths. 

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App Details

Teacher Ratings


Android, iPad, iPhone




Academic Relevance


In-App Purchases - No

In-App Advertising - No


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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 math 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 math teachers by providing answers faster than thought possible.
Teachers: Inspire your students as you pull answers to math problems out of thin air.

Master these math tricks:
* Multiply as high as 20x20
* Square a number ending in 5
* Square any two digit number
* Doubling and halving
* Multiply any number by 4
* Multiply any number by 5
* Multiply any number by 9
* Multiply any number by 25
* Multiply any number by 99
* Squares from 41 to 59
* Round number multiplication
* Divide any number by 5
* Multiply by 11
* Multiply in the 90's
* Square numbers in the 50's
* Multiply differing by 2,4,6
* Multiply if 1's sum is 10
* Multiply two close numbers
* Sum of first n even numbers
* Sum of first n odd numbers
* Subtracting two and three digit numbers
* Adding two and three digit numbers
* Quickly divide any number by 9
* Subtracting from 1000 and higher multiples of 10
* Multiply two numbers close to 10
* Nines complement
* Tens complement
* Large number addition #1
* Large number addition #2
* Large number subtraction
* 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
* 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

Prepare for the math section on 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. Use Mathemagics as a tutor to quicken up your test taking abilities.

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.


"Best New iPhone Education App"

May 2012
Featured in the App Store Test Prep promotion

December 2011
Featured as an AppStore Education Staff Favorite
Featured in the AppStore Hall of Fame

March 16, 2010
Featured in the EU AppStores as New and Noteworthy

December 8, 2009
Featured as an AppStore Best of 2009 App

November 17, 2009
Featured as an AppStore Essential (Apps for Boys)

September 22, 2009
Featured as an AppStore Essential (High School Survival Guide)

August 25, 2009
Featured as an AppStore Staff Favorite


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