Trick to square number b/w 100 and 109

Trick to square number b/w 100 and 109

105^2= ?? (calculate in 2 or 3 seconds)

STEP 1: Take the unit place of the number and add it to the original number:
105+5=110

STEP 2: Square the result from step 1(make it 2 digit number_ _)
5^2=25 ( it's 2 digit number) 

STEP 4: Then place result of step 2 after result of step 1:
110 and 25=11025


109^2= ?? (calculate in 2 or 3 seconds)

STEP 1: Take the unit place of the number and add it to the original number:
109+09=118

STEP 2: Square the result from step 1(make it 2 digit number_ _)
09^2=81 ( it's 2 digit number) 

STEP 4: Then place result of step 2 after result of step 1:
118 and 81=11881


103^2= ?? (calculate in 2 or 3 seconds)

STEP 1:Take unit place of number and add it with original number:
103+3=106

STEP 2:Square the result from step 1(make it 2 digit number_ _)
3^2=09( it's 2 digit number) 

STEP 4:Then place result of step 2 after result of step 1:
106 and 09=10609