Square any number up to 1000 (specially 2 digit and 3 digit) with this fast easy to understand math trick!
Even though I told in the video that it can be done in less than 30 seconds, but you can see that it actually requires 5 seconds at max. Some can be done instantly in mind.

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Please watch: "How to Calculate Faster than a Calculator - Mental Math #2"
[ Ссылка ]
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