“Who would draw a picture to divide 2/3 by 3/4?” asked Marina Ratner, a professor emerita of mathematics at the University of California at Berkeley, in a recent Wall Street Journal opinion piece.

This requires an algorithm: students are taught to stack one number atop another and multiply each digit of the bottom number ...

👉 Learn how to add and subtract fractions whose denominators are not the same. Recall that when we want to add or subtract ...