square number from 10 to 19 math trick - buneknowlegde

 Easiest method to find the square of any number between 10 and 19 

Step 1: First add the given number and the units digit .

Step 2: Then Square the unit's digit and put the number next to the result obtained in STEP 1.

 Ex-1:Find the square of 13 in 5 seconds

(13)2 = ?

Step 1: 13 + 3 = 16_

Step 2: 32 = 9

put the result obtained in step 2 in step 1 we get

Ans=169

Ex-2:Find the square of 16 in 5 seconds

 (16)2 = ?

        Step 1: 16 + 6 = 22_

Step 2: 62 = 36

put the result obtained in step 2 in step 1 as shown below                                                                          

22_

 36

Ans=256

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