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MATHS TRICK: HOW TO EASILY MULTIPLY NUMBERS OF THE SAME DIGIT THAT ENDS WITH 5

Good day Maths geniuses,Todayi wil tutoring on how to find the square root of a Number..
HOW TO FIND THE SQUARE ROOT OF A DIGIT THAT HAS A PERFECT SQUARE Numbers that has a perfect square are numbers that their square root is a whole number without decimal or remainder.. All you need to solve this is your book,biro and your understanding...Below are the steps to take :
1. Subtract odd numbers starting from 1 from the number you want to look for it's square root till you get 0.
2 . Count the numbers of odd numbers you used and that's the square root of the number.That's all
E.g Find the square root of 9
solution
9 - 1=8 , 8-3=5 and 5-5=0. That's all...Now,how many old numbers did i use to subtract..3 right.1,3,and 5 which means the square root 9 is 3
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