【實用教育app】Mencal:Mental Arithmetic Training, Improve Your Skills In Math|最夯免費app

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

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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

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