Multiple choice

\text{What approximate value should come in place of question mark (?) in the following questions?}\159 \times 43 - 37 \times 57 = ?^2

  1. 40

  2. 50

  3. 60

  4. 70

  5. 80
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

159 × 43 = 6837. 37 × 57 = 2109. Difference = 6837 - 2109 = 4728. Find n such that n² = 4728. 70² = 4900, 60² = 3600. 4728 is closer to 4900, so n ≈ 70. This matches option D.

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