Square 2 Digit Number with up down Method
Square a 2 Digit Number, for this example 37:
Look for the nearest 10 boundary.
In this case up 3 from 37 to 40.
Since you went UP 3 to 40 go DOWN 3 from 37 to 34.
Now' mentally multiply 34x40.
The way I do it is 34x10=340.
Double it mentally to 680.
Double it again mentally to 1360.
This 1360 is the FIRST interim answer.
37 is 3 away from the 10 boundary 40.
Square this 3 distance from 10 boundary.
3x3=9 which is the SECOND interim answer.
Add the two interim answers to get the final answer
Answer: 1360 + 9 = 1369
Notes
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