The first five positive integer multiples of 90 are:
1 x 90 = 90
2 x 90 = 180
3 x 90 = 270
4 x 90 = 360
5 x 90 = 450
The first 5 multiples of 45 are: 45, 90, 135, 180, and 225.
The multiples of five between sixty and ninety (inclusive) are 60, 65, 70, 75, 80, 85 and 90.
There are 3 such numbers: 30, 60, 90.
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.
Since the lowest common multiple of 9 and 2 is 18, all of the common multiples of 9 and 2 are multiples of 18. The first five are: 18, 36, 54, 72, 90 Since 9 is odd thean there are going to be odd numbers, which are not multiples of two.
The first 5 multiples of 45 are: 45, 90, 135, 180, and 225.
First three common multiples of 5 and 6 are 30, 60 and 90.
18, 36, 54, 72, 90
30, 60, 90
30, 60, 90
18, 36, 54, 72, 90.
30, 60, 90, 120, 150
30, 60, 90, 120, 150
45, 90, 135, 180, 225
These are the first 90 multiples of 7:714212835424956637077849198105112119126133140147154161168175182189196203210217224231238245152159266273280287294301308315322329336343350357364371378385392399406413420427434441448455462469476483490497504511518525532539546553560567574581588595602609616623630
Oh, what a happy little question! The first five multiples of 18 are 18, 36, 54, 72, and 90. Just imagine each multiple as a little tree in a row, swaying gently in the breeze. Keep painting those multiples, and soon you'll have a whole forest of numbers to admire!
6+12+18+24+30=90