Trick to square number b/w 10 and 19

Trick to square number b/w 10 and 19

16^2=?? (calculate in 2 or 3 seconds)
STEP 1: Add the number to the ones digit:
16+6=22

STEP 2: Multiply this number by 10:
22*10=220

STEP 3: Square the one's digit number:
6^2=36

STEP 4: Then add lastly calculated numbers:
220+36=256


18^2=?? (calculate in 2 or 3 seconds)

STEP 1: Add the number to the ones digit:
18+8=26

STEP 2: Multiply this number by 10:
26*10=260

STEP 3: Square the one's digit number:
8^2=64

STEP 4: Then add lastly calculated numbers:
260+64=324

14^2=?? (calculate in 2 or 3 seconds)

STEP 1: Add the number to the ones digit:
14+4=18

STEP  2: Multiply this number by 10:
18*10=180

STEP 3:  Square the one's digit number:
4^2=16

STEP 4: Then add lastly calculated numbers:
180+16=196