Monday, December 9, 2013

Undiscovered App #51: Mencal - Tips and Tricks for Mathletes

MencalI like Math, but I like it even better when I learn quick shortcuts for how to calculate big or complex numbers. Enter today's Undiscovered App, called Mencal, which does just that.

Mencal focuses on the type of mathematical situations that you'd see on a more regular basis, like addition, subtraction, multiplication, division, and squaring, so it's very practical.



Check out the list of things you could do once you master its quick lessons:

#-------------Addition--------------#
• Two-digit number like ab+ba
• Three-digit number like abc+cba
• Two fractions like 1/a+1/b
• Two fractions like (a-1)/a + (b-1)/b
• Sum of first n odd numbers
• Sum of first n even numbers

#------------Substraction-----------#
• Two-digit number like ab-ba
• Three-digit number like abc-cba
• m-n if m+n=100,1000,10000...
• Two fractions like 1/a-1/b
• Two fractions like c/a-c/b
• Two fractions like (a-1)/a-(b-1)/b

#-----------Multiplication----------#
• Same ten's digit, 1's sum is 10
• Same ten's digit, 1's sum isn`t 10
• Same 1's digit, ten's digits sum is 10
• Same 1's digit, ten's digits sum isn`t 10
• two-digit number ab×cc (a+b=10)
• ab×ccc.....c (a+b=10)
• Multiply by 11
• 2-digit number if 1's digit is 1
• 2-digit number if tens place digit is 1
• 2-digit number ×2-digit number(universal)

#--------------Division-------------#
• Divide any number by 5
• Divide any number by 25
• Divide any number by 125
• Divide any 3-figure number by 9

#--------------Square---------------#
• Square numbers made up of 1's
• Square numbers made up of 3's
• Square numbers in the 90's
• Square numbers ten`s digit is 0
• Square a number ending in 25
• Square numbers made up of 6's
• Square numbers made up of 9's
• Square a number ending in 1
• Square a number ending in 5
• Square a number ending in 9
• Square numbers in the 10's
• Square numbers in the 40's
• Square numbers in the 50's

Once you learn the lesson, you're able to practice the concept with live examples until you've got it down cold. This is the kind of stuff that can make you look like a mathematical genius in class, so long as you don't spill the beans about how you did it.

Mencal has an average rating of 4 stars out of 24 reviews, and it costs $1.99 to download. Granted, you could probably Google all these methods if you want to go the free route, but there's definitely something nice about having everything you need all in one app, plus having the live questions to test your skills immediately afterward is a bonus that you won't easily be able to replicate.

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Amazon.com: because today is a great day to finally order that stuff sitting in your shopping cart!

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