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What percentage of numbers from 1 to 70 have squares that end in the digit 1?

Correct answer: C. 20

  • A. 1
  • B. 14
  • C. 20
  • D. 21

Explanation

A square ends in 1 when its number ends in 1 or 9. From 1 to 70 there are 7 numbers ending in 1 and 7 ending in 9, giving 14 numbers; the percentage is 14 / 70 x 100 = 20%. Option b, 14, is the count of numbers, not the required percentage.

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Percentages express a quantity as parts per hundred and support calculations involving increases, decreases, discounts, commissions, taxes, and successive changes. Questions require distinguishing percentage change from percentage points and identifying the original value when a final value and its percentage change are given.

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