To square a number ending in 5, multiply the tens digit by the next consecutive number, then append 25 to the result. For example, 25² = 2 × 3 = 6, so 25² = 625; 65² = 6 × 7 = 42, so 65² = 4225; 95² = 9 × 10 = 90, so 95² = 9025.
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How to square numbers ending in 5 in 2 secondsAdded:
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.
Next number of six is seven, so seven times six is 42 and we write 25.
Next number of nine is 10, so 10 times nine is 90.
And we write 25. That's our answer.
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