“This was the best money I have ever spent on a teaching tool.” ~ a teacher in Wisconsin

Alabama Math Standard: 6.NS.B.7

Use the distributive property to express the sum of two whole numbers with a common factor as a multiple of a sum of two whole numbers with no common factor.

Broken Calculator: Simplifying Fractions

Broken Calculator: Simplifying Fractions

This calculator simplifies fractions with a rule that sometimes works. What is it doing wrong?