HCF and LCM

Learn different methods for finding the highest common factor and lowest common multiple of two or three numbers. This video is to help you do the online, self-marking exercise which can be found here:
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1:11 Basic method
2:34 Factor Trees and Venn Diagram method
5:01 Indian method
9:53 Three numbers method
11:29 Calculator trick
13:06 Finding the numbers given their HCF and LCM
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