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Number Theory Level 1

What is the answer-

Multiply 75 x 75 without calculator ?


The answer is 5625.

Surbhi Agarwal by Surbhi Agarwal , 26, India

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1 solution

Surbhi Agarwal
Dec 11, 2014

Write a solution. To solve the problem without calculator - First multiply 5 x 5= 25 write it to right and then increase 7+1= 8 and multiply it by 7 => 7 x8=56

The answer is = 5625

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Precisely. a 5 ‾ 2 = ( 10 a + 5 ) 2 = 100 a ( a + 1 ) + 25 \overline{a5}^2=(10a+5)^2=100a(a+1)+25

Satvik Golechha - 6 years, 6 months ago

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Wonderful Explanation :3

Krishna Ar - 6 years, 6 months ago

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