iPhone Giveaway of the Day - Mencal:Mental Arithmetic Training

Example:38×32=1216(Same ten's digit,1's sum to 10)
①:Multiply tens place digit by itself plus 1
(3+1)×3=12
②:Add two zeros to the end of step①
12×100=1200
③:Multiply the two one's digits together
8×2=16
④:Add the results of step② and ③
1200+16=1216

"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 Willwang1985
......

Now you can easily improve your skills in mental arithmetics! Mencal is an app help you with your mental arithmetic.There are many tutorials and smart test engine in this app.

#-------------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