BIG Multiplication by subtracting Easy Math Trick

This multiplication trick is really pretty obvious when you think about it.
Do you know it?

Here is THE mental multiplication lesson playlist - progressing you through your mental multiplication.
https://www.youtube.com/playli....st?list=PLjbxBzUM6SL

Here is that link how to multiply questions like 3 x 54 instantly
https://youtu.be/yZULgerBRms


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