Fast Mental Multiplication Trick - Multiply in your head using base 20 and 30
16:23
YouTubetecmath
Fast Mental Multiplication Trick - Multiply in your head using base 20 and 30
This mental multiplication trick uses the idea of a third number - a base number - to help us multiply two numbers in your head. This series of videos first looks at multiplying numbers near 10 using base 10. The second video looks at multiplying using base 20 and 30. The third video looks at how to apply this mental multiplication trick to ...
1.1M viewsFeb 22, 2013
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