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2025 AMC 10B Problem 18

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2025 AMC 10B Problem 18AMC 10 Step by Step
Name:                             Date: September 13, 2026
Sequences & Series · difficulty 3 of 5 · about 5 min · position P16-20

What is the ones digit of the sum ⌊1⌋+⌊2⌋+⌊3⌋+⋯+⌊2025⌋?\lfloor \sqrt{1} \rfloor + \lfloor \sqrt{2} \rfloor + \lfloor \sqrt{3} \rfloor + \dots + \lfloor \sqrt{2025} \rfloor? (Recall that ⌊x⌋\lfloor x \rfloor represents the greatest integer less than or equal to xx .)

  1. A)

    11

  2. B)

    22

  3. C)

    33

  4. D)

    55

  5. E)

    88

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