iPad Screenshots


This math app is about the concept of order of operations. The user can evaluate random and custom expressions with exponentiation, division, multiplication, addition, and subtraction operations on integers and decimals. Operations can be grouped with nested parenthesis.

Expressions are evaluated one operation at a time just by tapping the operation. If the user taps an operation that can’t be solved next, the app tells why that was the wrong choice. There are no penalties for wrong answers.

After each step the solution for the current operation flies to the correct place. For example after solving 3 - 1 the answer 2 will fly to the correct place and the rest of the expression will move down. That way the user sees that only one part of the expression is solved in each step.

The user learns that the complexity of the initial expression does not matter because you only need to solve one multiplication, division, addition, or subtraction at each step.

The app uses a hierarchy of operators triangle - boss triangle - that shows the order of operations using a pyramid with exponent at the top, x and ÷ in the middle and + and - at the bottom. The rules are shown in a visual way instead of mnemonics.

Settings for random problems:

-allow multiplications
-allow divisions
-allow exponents
-allow negative numbers
-allow multi-digit numbers
-allow decimals
-allow parenthesis
-allow nested parenthesis

Other iDevBooks math apps

iDevBooks math apps have been reviewed and endorsed by Wired.com, IEAR.org, Teachers with Apps, and other other respected sites and organizations.

Some of the 25 other iDevBooks math apps are Visual Multiplication Table, Visual Fractions Decimals and Percentages, Decimal Rounding, Whole Number Rounding, Column Subtraction, Column Addition, Long Division, Long Multiplication, Lattice Multiplication, Fraction Math, Partial Differences Subtraction, Partial Quotients Division, Partial Sums Addition, etc.

Feedback and requests for new features

New ideas to make this app better are welcome. Please visit idevbooks.com to give feedback.


This app has no ads or in-app purchases and it does not transmit any data during the operation of the app. This app also does not contain any links to other apps or the web.

What's New

Version 3.0

- support for iOS 9.3

Please visit iDevBooks.com if you have any feedback or you want information about 26 iDevBooks math apps.

Ratings and Reviews



The app helped my daughter understand the order of operations. Easy to use and understand. Thank you!


Bryan Baz

These are some of the most original math learning apps on the App Store, and they are excellent.

Pretty good!


This app really helps with learning order of operations. It informs the student of when they are solving an operation in the wrong order and what should come first. It also tests their addition, subtraction, multiplication and division skills. It is possible though for a student to just click o the choices until they find the correct number. Really the only thing that bugged me about this app was that, in the rules section, it said that Exponents were the highest priority when really Parentheses were. When actually solving the problems, it said that parentheses came first. This could be confusing for some students.


Esa Helttula
1.4 MB
Requires iOS 8.0 or later. Compatible with iPad.
Age Rating
Rated 4+
© Esa Helttula


  • Family Sharing

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

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