225 is the 75th multiple of 3.
999 is the 333rd multiple of 3.
In the time it would take me to type 258 numbers, I can answer a lot of other questions.
Here's the first ten:
225, 228, 231, 234, 237, 240, 243, 246, 249, 252, 255 and just keep adding three until you get to 999.
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Since 75 is a multiple of 25, all of its multiples are common.
what is the ratio of multiples of 3 between 1 and 100 to all numbers between 1 and 100
9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99, 108, 117, 126, 135, 144, 153, 162, 171, 180, 189, 198, 207, 216, 225, 234, 243, 252, 261, 270, 279, 288, 297, 306, 315, 324, 333, 342, 351 and keep adding nine until you get to 999.
90. All numbers that are multiples of 3, 5 & 9 are multiples of their lowest common multiple lcm(3, 5, 9) = 45 → multiples of 45 between 49 and 95 is 2 x 45 = 90.
They are all multiples.