This document explains the basic idea behind cross multiplication: in two equivalent fractions, the cross multiplications are equal.
It is intended to be self-explanatory for students, but could be used by teachers/parents who are teaching this topic.
This lesson also includes a small number of sample questions (6) first unsolved for student practice, then repeated with solutions so students can check their work.
It is handwritten on a tablet PC and uses colour to assist in the explanations. Although the colour is helpful, the file can be reproduced in black and white and is still useful.
At a later date, I may replace this file with one where the text has been typed up and only the solutions are handwritten. But for now, the entire document is handwritten.
Please see the mini-lesson "Solving One Step Equations" for background skills necessary to complete this lesson.
Cross Multiplying by Sarah Rainsberger
is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License