Let us take a 2 digit number ending in 5 i.e 45
Now (45)²
Step 1: multiply the digit at tens place by a number 1 greater than that i.e.4*5 =20
Step 2: write 25 after the multiplication i.e. 2025
Hence,(45)² =2025
Lets try it with a different two digit number ending in 5 i.e. 65
(65)²= (6*7)/25=4225 (done in 3 seconds or may be lesser than that)
Hope you enjoyed
Now try to do it with
1)85
2)55