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Q. Find the squares of the following numbers containing 5 in unit’s place.
(iii) 105
Answers (1)
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Assume a number with unit digit 5 = a5
= 100a(a + 1) + 25
= a(a + 1) hundred + 25.
We will use this concept here.
a = 10; so
= 10(10+1)hundred + 25
= 10(11)hundred + 25
= 11000 + 25 = 11025