The correct option is D 7225Consider a number with unit digit 5, i.e., a5 (a5)2 = nbsp;a(a + 1) hundred + 25 Hence, nbsp;(85)2 = 8(8+1) x 100 + 25 nbsp ...

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Standard V

Mathematics

Multiplication Calculations

Solve: 85 × 8...

Question

Solve: 85 $\times$ 85 =_____

7115

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7215

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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 = a(a + 1) hundred + 25

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

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Solve: 85× 85 =_____

The correct option is C 7225Consider a number with unit digit 5, i.e., a5 (a5)2 = a(a + 1) hundred + 25 Hence, (85)2 = 8(8+1) x 100 + 25 = 7225

Solve: 85 $\times$ 85 =_____

The correct option is C 7225
Consider a number with unit digit 5, i.e., a5

(a5)² = a(a + 1) hundred + 25

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