How to square numbers ending in 5 in 2 seconds

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[00:00:00]Next number of two is three, so two times three is six and we write 25. That's our answer. 25 squared is 625. 25 * 25 it means.

[00:00:15]Next number of six is seven, so seven times six is 42 and we write 25.

[00:00:23]Next number of nine is 10, so 10 times nine is 90.

[00:00:27]And we write 25. That's our answer.