Where I post assorted thoughts and links relating to learning, specifically learning difficulties, learning disabilities, dyslexia, dysgraphia, "dyscalculia" and all the other reasons people struggle with numbers and math and arithmetic, reading, Orton-Gillingham stuff and ... whatever!

Saturday, February 10, 2007

Steps to Dividing Fractions

... this is stolen, unabashedly, from our developmental math instructor's notes which are appropriately required for all students. This assumes you know the prerequisites - but this is a sticking point for enough people so I"m posting it :)

First change 'em to improper fractions if you have to.


1. Copy the first fraction.
2. Write times for division
3. Flip the third fraction.
4. Multiply 'em.

... I will usually mention one of my favorite "big ideas" - that you're not "changing division to multiplication" at all; you're also changing the fraction, which "balances" the change. You give to one thing, and take from the other, so really it's the same thing but written in a way that makes it easier to get the eright answer.
I will have done a few visuals to show what it is like to really divide something **by** a half, and how that is different from dividing something *into* halves.

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