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There are some key words that you need to know for circles: radius, circumference, diameter, sector, segment, tangent, chord and arc. In this video you will discover what they all mean.

This video discusses the topic of circles.

Part 1: Comparing like and unlike fractions
Part 2: Examples of comparing like and unlike fractions
Part 3: Common mistakes made when comparing fractions

This video explains the equation of a circle.

Fraction comparison with lowest common denominators.

This video explains how to order fractions by their size.

This YouTube video explains how to calculate an irregular area on a map.

This YouTube video explains how to calculate a regular area on a map.

This online tutorial guides you through what information a map shows, map legends and the different types of maps which are available.

YouTube video that explains how to use prime factorization to find the highest common factor and lowest common multiple. It is very simple using the method described in the video.