Fractions: Changing a Subtraction Problem with Borrowing into a Basic Addition Problem

https://pixabay.com/photos/cake-pie-sweet-food-tasty-2064637/ 5/6–1/12 = yummm

I encourage my students to share the tricks they’ve figured out with me. A couple years back, I had a student who told me that when they are subtracting and have to borrow, they subtract the number from the 10 and then add the result. For example: 23–8, they borrow 10 from the 20, and subtract 8 from it, leaving 2, and then add the 2 and the 3…