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55 five55 is a square pyramidal number. 55 is: . the 10th Fibonacci number [1] and the 10th triangular number, [2] The sum of 55's dits is also 10.; the 5th heptagonal number, [3] the 5th squareHow much is 5% of 55? Use this easy and mobile-friendly calculator to calculate 5 percent of 55, or any other percentage. . Math. Contact Us. Calculate 5% of 55. What is 5