Dear Aunt Sally 4.0
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Free Version
Publisher Description
The mnemonic “Please Excuse MY DEAR AUNT SALLY” helps students remember the Order of Operations, or PEMDAS used to solve algebraic expressions. We look under the hood.
PEMDAS is an acronym that is taught in school classrooms across the nation. It helps students remember the priority, or Order of Operations, used to solve expressions involving strings of numbers and operators. It stands for:
P(arenthesis)
E(xponent)
M(ultiplication)
D(ivision)
A(ddition)
S(ubtraction)
A familiar mnemonic widely used in place of PEMDAS is: Please Excuse My Dear Aunt Sally. Thus the name of this application... Kind of an inside joke for the mathematical types.
Computers, including smart phone calculators, desktops, etc. have built in functionality to properly interpret such expressions so we don't have to. But have you ever wondered what algorithms the CPU executes to get the right answer every time? This app demonstrates one such algorithm called the Shunt Yard, developed a few years back by Professor Edsger W. Dijkstra.
We’re going to take a closer look under the hood at Order of Operations algorithms. It will interest programmers and school students alike; for programmers, the use of queues and stacks will reinforce previous computer science learning; for students, it allows them to write an expression, then analyze it using Order of Operations rules, step by step. The Quiz mode generates random expressions of user selected lengths and magnitudes and checks the student's answer. Incorrect answers can be examined using the same step by step process.
In the SOLVE mode, algebraic expressions are entered free hand using an internal keyboard which limits entries to the five common mathematical operators (+ - / * ^) as well as one level of parenthesis. There is a maximum term limit of ten variables, but no limit to their magnitude in this mode.
In the QUIZ mode, between two and ten variables can be selected, their maximum value and which operators that are eligible. The program then randomly generates an algebraic expression using these parameters.
Both modes make available an analysis page which is used to step through the solution. Stack/Queue dynamics are displayed.
Apr 24, 2024
Version 4.0
Added PrivacyInfo.xcprivacy plist; direct rating/review method
About Dear Aunt Sally
Dear Aunt Sally is a free app for iOS published in the Kids list of apps, part of Education.
The company that develops Dear Aunt Sally is Neil Rohan. The latest version released by its developer is 4.0.
To install Dear Aunt Sally on your iOS device, just click the green Continue To App button above to start the installation process. The app is listed on our website since 2024-04-24 and was downloaded 1 times. We have already checked if the download link is safe, however for your own protection we recommend that you scan the downloaded app with your antivirus. Your antivirus may detect the Dear Aunt Sally as malware if the download link is broken.
How to install Dear Aunt Sally on your iOS device:
- Click on the Continue To App button on our website. This will redirect you to the App Store.
- Once the Dear Aunt Sally is shown in the iTunes listing of your iOS device, you can start its download and installation. Tap on the GET button to the right of the app to start downloading it.
- If you are not logged-in the iOS appstore app, you'll be prompted for your your Apple ID and/or password.
- After Dear Aunt Sally is downloaded, you'll see an INSTALL button to the right. Tap on it to start the actual installation of the iOS app.
- Once installation is finished you can tap on the OPEN button to start it. Its icon will also be added to your device home screen.
