Trick to square number b/w 90 and 99

Trick to square number b/w 90 and 99

98^2= ?? (calculate in 2 or 3 seconds)
STEP 1: Subtract the number from 100:
100-98=02

STEP 2: Now subtract the calculated result from original number:
98-02=96

STEP 3: Square the result from step 1(make it 2 digit number_ _)
2^2=04 ( it's 2 digit number)
 
STEP 4: Then place result of step 4 after result of step 1:
96 and 04=9604

96^2= ?? (calculate in 2 or 3 seconds)
STEP 1: Subtract the number from 100:
100-96=04

STEP 2: Now subtract the calculated result from original number:
96-04=92

STEP 3: Square the result from step 1(make it 2 digit number_ _)
4^2=16 ( it's 2 digit number)
 
STEP 4: Then place result of step 4 after result of step 1:
92 and 16=9216

93^2= ?? (calculate in 2 or 3 seconds)
STEP 1: Subtract the number from 100:
100-96=07

STEP 2: Now subtract the calculated result from original number:
93-07=86

STEP 3: Square the result from step 1(make it 2 digit number_ _)
7^2=49 ( it's 2 digit number) 

STEP 4: Then place result of step 4 after result of step 1:
86 and 49=8649