Math tricks

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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