Step 1: Since the no.s end with one our answer will contain the last digit as 1. Have that in mind.
Step 2: Now add both the tens digits i.e., (x + y) this is you tens place. (In case of double digit add it after step 3)
Step 3: Again take those two previous no.s and now multiply them i.e., (xy) this will give you the hundreds place in case of a single value or also a thousands place along with it if it is a double digit.
Finally put them all together and that's your answer
e.g 41 x 61
ones digit: 1
tens digit: 10 so, 0 (1 will be carried)
Hundreds digit: 24
Final answer: 2501
Squaring numbers ending with 5 is a simple trick that you must have in your sleeve.
Step 1: Multiply the ones digit. i.e., 5 x 5 = 25
Step 2: Multiply the no. and the next no. i.e n(n+1).
Now write the two no.s together and that's the final answer you'll obtain.
5 x 5 = 25
Now 3(3+1) = 3(4) =12.
Writing the no.s together we get the answer 1225. which is the square of 35.
Now try to re-trace the same pattern in the above picture.
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