Mencal 4+
Mental Math Tricks
INSTANT.CJ

 $1.99
 Offers InApp Purchases
Screenshots
Description
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
 twodigit number ab×cc (a+b=10)
 ab×ccc.....c (a+b=10)
 Multiply by 11
 2digit number if 1's digit is 1
 2digit number if tens place digit is 1
 2digit number ×2digit 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
 Twodigit number like ab+ba
 Threedigit number like abc+cba
 Two fractions like 1/a+1/b
 Two fractions like (a1)/a + (b1)/b
 Sum of first n odd numbers
 Sum of first n even numbers
 Twodigit number like abba
 Threedigit number like abccba
 mn if m+n=100,1000,10000...
 Two fractions like 1/a1/b
 Two fractions like c/ac/b
 Two fractions like (a1)/a(b1)/b
 Divide any number by 5
 Divide any number by 25
 Divide any number by 125
 Divide any 3figure 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
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
 twodigit number ab×cc (a+b=10)
 ab×ccc.....c (a+b=10)
 Multiply by 11
 2digit number if 1's digit is 1
 2digit number if tens place digit is 1
 2digit number ×2digit 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
 Twodigit number like ab+ba
 Threedigit number like abc+cba
 Two fractions like 1/a+1/b
 Two fractions like (a1)/a + (b1)/b
 Sum of first n odd numbers
 Sum of first n even numbers
 Twodigit number like abba
 Threedigit number like abccba
 mn if m+n=100,1000,10000...
 Two fractions like 1/a1/b
 Two fractions like c/ac/b
 Two fractions like (a1)/a(b1)/b
 Divide any number by 5
 Divide any number by 25
 Divide any number by 125
 Divide any 3figure 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
What's New
Version 3.70
● Ready for iPhone X
● Additional bug fixes and stability improvements
● Remove math game InApp purchase
● Additional bug fixes and stability improvements
● Remove math game InApp purchase
Ratings and Reviews
Great App
Donn1hew
You just have to devote time do the application and do examples over and over and over again. With time your master these exercises. Your mastery will save you a lot of time.
Could be great
Ecp84
This is the bestlooking app of this sort that I have seen (other than the choice of handwritten/chalkboard font for the numbers), but something tells me the appearance took precedence over the importance of utility. The instructions for methods are sometimes unclear, and not only because it looks as though the person who wrote it was not a native Englishspeaker. Sometimes crucial words are omitted. Sometimes it's just unclear what's being said.
Additionally, it is my opinion that the app could use some expansion regarding how one is able to test oneself. Let the user test him or herself incrementally with each step as they begin to understand it, or allow the user to include or omit the methods used in the testing portion. Otherwise, it requires the user to master and understand each kind of method before feeling they can challenge themselves effectively. Otherwise, this is a great app, and a beautiful one to boot. I'd love to use this more often if I could seem to have it work more in my favor as I learn and test myself with each method. It certainly had great potential, and I look forward to seeing how/if it changes in the future.
Additionally, it is my opinion that the app could use some expansion regarding how one is able to test oneself. Let the user test him or herself incrementally with each step as they begin to understand it, or allow the user to include or omit the methods used in the testing portion. Otherwise, it requires the user to master and understand each kind of method before feeling they can challenge themselves effectively. Otherwise, this is a great app, and a beautiful one to boot. I'd love to use this more often if I could seem to have it work more in my favor as I learn and test myself with each method. It certainly had great potential, and I look forward to seeing how/if it changes in the future.
I really WANT to love this app so much
Happyspringday
Like at least one other reviewer, I don't think the app creator has a great grasp on English, which is understandable. English is a difficult language. That said, I think the app creator should vet the app with an English speaking person.
Secondly, but more importantly, I tried one of the tricks 267x11 but could not reproduce the correct answer using the "trick". I end up with 3,117 using the trick. (Correct answer is 2,937). Maybe it's the language issue or maybe the trick is not correct. Either way, I love the CONCEPT just struggling with the execution.
Secondly, but more importantly, I tried one of the tricks 267x11 but could not reproduce the correct answer using the "trick". I end up with 3,117 using the trick. (Correct answer is 2,937). Maybe it's the language issue or maybe the trick is not correct. Either way, I love the CONCEPT just struggling with the execution.
Information
 Seller
 Jun Cao
 Size
 9.7 MB
 Category
 Education
 Compatibility
 Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.
 Languages
 English, Simplified Chinese, Traditional Chinese
 Age Rating
 Rated 4+
 Copyright
 © INSTANT.CJ
 Price
 $1.99
 InApp Purchases

 Unlock all math games $0.99
Supports

Family Sharing
With Family Sharing set up, up to six family members can use this app.