The square of number 85 is:

7115

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7205

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7225

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7375

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Solution

The correct option is C
7225

Consider a number with unit digit 5, i.e., a5

(a5)² = (10a + 5)²
= 10a(10a + 5) + 5(10a + 5)
= 100a² + 50a + 50a + 25
= 100a(a + 1) + 25
= a(a + 1) hundred + 25

Hence, (85)² = 8(8+1) x 100 + 25 = 7225

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