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90 has an infinite number of multiples.
10, 20, 30, 40, 50, 60, 70, 80, 90, 100 are first 10 multiples of 10first 10 mutiples of 10 = 10, 20, 30, 40, 50, 60, 70, 80, 90, 100.
To find the common multiples of 54 and 90, first list the multiples of each number. The multiples of 54 are 54, 108, 162, 216, etc. The multiples of 90 are 90, 180, 270, 360, etc. The common multiples of 54 and 90 are numbers that appear in both lists, such as 180 and 360.
Multiples of 9 up to 100 are 9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99. Multiples of 10 up to 100 are 10, 20, 30, 40, 50, 60, 70, 80. 90, 100. The only common multiple up to 100 of 9 and 10 is 90.
90,180,270,360,450,540,630,720,810,900.....