18, 36, 54, 72, 90, 108, 126, 144, 162, 180, 198, 216, 234, 252, 270, 288, 306, 324, 342, 360, 378, 396, 414, 432, 450, 468, 486, 504, 522, 540, 558, 576, 594, 612, 630, 648, 666, 684, 702, 720, 738, 756, 774, 792, 810, 828, 846, 864, 882, 900, 918, 936, 954, 972, 990.
They are: 9/1000 itself and its equivalent fractions such as 18/2000
floor(1000/8)=125
333
4,8,12,16,20,24,28,32,36,40,44,48,52,56,60,64,68,72,76,80,84,88,92,96,100.
4
The question is asked incorrectly. "The" six multiples of 18 means there are only six multiples. 18 times any integer is a multiple of 18, thus: 18 x 0 = 0 18 x 1 = 18 18 x 2 = 36 18 x -1 = -18 etc. As you see, there are infinitely many multiples of 18, not just 6.
The multiples of 18 are 1,2,3,6,9,18 and the multiples of 25 are 1,5,25 so the greatest is 1, its the only one they share.
144, 288, 432, 576, 720, 864.
630 and all its multiples.
That probably refers to the SI prefixes, such as kilo (meaning 1000), mega (meaning a million), milli (meaning 1/1000), etc.
18 * 1 = 18 18 * 2 = 36 18 * 3 = 54
Multiples of 25 up to 1000 are: 25;50;75;100;125;150;175;200;225;250;275;300;325;350;375;400;425;450;475; 500;525;550;575;600;625;650;675;700;725;750;775;800;825;850;875;900;925;950;975;1000