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Review of arithmetic with fractions I | Year 9 Maths 2 | NJ Wildberger

3,212 views · Published 11 February 2014 · 43:45 · Indexed 6 October 2026

Channel: Insights into Mathematics · 2014 · Education

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This video is one of several that review basic aspects of arithmetic that Year 9 students ought to know before they begin their study. In this lecture I summarize how to think about fractions and how to visualize them in the context of the number line. This is an essential point of view for Year 9 mathematics.

There are some subtle issues here: the topic of fractions is not easy and is really the highlight of primary school arithmetic. Unfortunately many students do not think about fractions in a good way, and of course the modern reliance on calculators adds to the problem, removing opportunities for students to practice basic arithmetic with them.

Fractions come about by dividing integers, but we will rather emphasize that it is the position on the number line which is the most important aspect of them. 

Naturally we include some problems to help you practice your skills!

Video Content:
00:00 Introduction to fractions
4:56 Fractions of the form 1 over n
10:28 Division of ordinary natural numbers
23:40 Fractions in terms of a number line
31:07 Equivalent fractions

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