Mencal - Mental Math Tricks
军 曹
Mencal is an app help you expand your ability to mentally solve math problems. All of us can do simple addition and subtraction of one or two digit numbers without a calculator.Now mencal is here to kick that ability into overdrive. Mencal provides you with lessons and simple tricks to allow you to: work with three digit numbers; fractions of different styles regardless if you are adding them or subtracting them; and finding sums with multiplication and division. Then it will test you on your grasp and knowledge of the methods you've learned. • Example: Same ten's digit,1's sum to 10 38×32=1216 ①:Multiply tens place digit by itself plus 1 (3+1)×3=12 ②:Add two zeros to the end of step① 12←00=1200 ③:Multiply the two one's digits together 8×2=16 ④:Add the results of step ②and③ 1200+16=1216 • Quickly 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 - Square numbers in the 500's - Square numbers in the 600's - Square numbers in the 700's - Square numbers in the 800's - Square numbers in the 900's •Standard: - 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) - Multiply differing by 5 - Multiply differing by 6 - Multiply differing by 7 - Multiply differing by 8 - Multiply differing by 9 - Multiply differing by 10 - Multiply two numbers that in the 90‘s - 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 - 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 - Divide any number by 5 - Divide any number by 25 - Divide any number by 125 - Divide any 3-figure number by 9 "This app rocks!! Great for Math Team practice!" - by Bubba Smith "Great app, make me feel less stupid" - by Howie_Serious "Its a useful app for anyone who wants to know the numbers deeper" - by sjzbim "It's a good app for both kids and sometimes even adults" - by Willwang Love mencal or have a question? We would love to hear your feedback! Contact us anytime at instantcj@gmail.com
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