Here is a great technique for multiplying two 3-digit numbers! Practice with 2-digit numbers as taught in the video, and work your way up.
It's not completely done in your head, but since you can write down the digits as you go, it can appear that way. It looks especially good if you can remember the numbers you carry, instead of writing them down.
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YouTube
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1 Response to Multiplying Two 3-Digit Numbers
I just tried this technique with 123*456, which should yield 56088 as the result. However, using this "dirty" trick, I get 57048. This method of multiplying numbers therefore isn't universal, and I cannot recommend it.
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