This is a task that I have done with a group of year 6 students. They were tasked with using a program (most used scratch) to create a kind of calculator. Essentially they had to write the code that would enable people to punch in a sum and have it answered by the sprite on screen. Students created different versions of the calculator depending on their confidence, some could do only basic addition while other could do multiplication. Students were forced to consider a variety of things they had never thought about when covering these topics in a more traditional way. What if the user accidentally puts in a decimal place? Will this 'crash' my calculator? Would a decimal place alter the answer of this sum anyway? I've provided a link to a much more complex version of a scratch calculator to give you an idea of what the students were working towards.
https://scratch.mit.edu/projects/12590430/
#csertask3Scratch – simple calculator

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