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What is 25% of the sum of the first 56 natural numbers?

Answer and explanation

Correct answer: 399

Direct answer: option A, 399. First find the sum of the first 56 natural numbers: S₅₆ = 56 × 57/2 = 28 × 57 = 1596. The phrase 25% means 25/100, which simplifies to 1/4. Therefore, 25% of 1596 is 1596 ÷ 4 = 399. Option A is correct, and a check is 399 × 4 = 1596. Option B, 409, is not one-fourth of 1596 and may come from an addition or division error. Option C, 419, is similarly inconsistent with the percentage calculation. Option D, 429, is also too large for one-fourth of 1596. The two essential steps are first calculating the sum and then taking one-fourth of it. Memory cue: 25% always means one quarter, so divide the required quantity by 4.

Related tags

SequencesPercentagesPartial-SumsNatural-NumbersSum Of First N Natural NumbersSequences And ProgressionsMathematicsClass 9 Mcq

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