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Grade: 12th Pass

                        

Squaring a 2- digit no. beginning with 9 Take a 2-digit number beginning with 9. Subtract it from 100. Subtract the difference from the original number: this is the first part of the answer. Square the difference: this is the last part of the answer. ? EXAMPLE If the number is 96 , subtract: 100 - 96 = 4, 96 - 4 = 92. The first part of the answer is 92 _ _ . Take the first difference (4) and square it: 4 × 4 = 16. The last part of the answer is _ _ 16. So 96 × 96 = 9216 .

6 years ago

Answers : (1)

Sumit Majumdar
IIT Delhi
askIITians Faculty
137 Points
							Dear student,
You are perfectly correct, Let me tell you with another number:
a) Let the number be 94.
b) Subtract it from 100, we get: 6.
c) We subtract the difference from the original number i.e. 94-6=88.
d) Now we square the original difference, we get:
6\times6=36
e) Hence, the required number is
8836.
Regards
6 years ago
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