Coding & Inquiry: Determine Integer Operation Rules

March 18, 2018

In this challenge, students can code an app to determine the rules for addition, subtraction, multiplication or division of two integers.

Classroom application:

After building this Scratch app, have students run through a set of different numbers and record their observations (e.g.: multiplying two negative numbers yields a positive product). From here, have them determine appropriate rules for addition, subtraction, multiplication and division rather then telling them. It may take some time for them to make a conclusion, but that in itself is a mini Science lesson.

Project page:



In the next class, have students determine “why” the rules are what they are (e.g.: using temperature or money). This would provide a great opportunity for observation and conversation in terms of assessment.


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