18 and 36
Take the multiples of 3: 3, 6, 9, 12, 15, 18, 21, 24, etc. Now, eliminate every fourth number in the sequence (the multiples of 4). The remaining numbers will be multiples of 3, but not of 4.
The product of two numbers that are the same is called a square. Examples: 2 * 2 = 22 = 4 9 * 9 = 92 = 81
what multiples do 7,5 and 9 have that are the same
8 and 9 are corpime, so their first common multiple is their product. The next common multiples are simply the multiples of that first multiple.The first three common multiples are therefore 72, 144 and 216.
If they are multiples of 9, the digits add up to a multiple of 9.
18 and 36
18 and 36.
Take the multiples of 3: 3, 6, 9, 12, 15, 18, 21, 24, etc. Now, eliminate every fourth number in the sequence (the multiples of 4). The remaining numbers will be multiples of 3, but not of 4.
45, 54
9 multiples
Impossible. With all multiples of nine the product of its digits is 9. Take, for exampe, 117 or 153.
The third multiple of 3 is 9 and the fourth multiple of 4 is 16. So 9 multiplied by 16 is 144.
The multiples of 6 is 6,12,18,24,30,36,42,48,54,60,66,72,78,84,90.................. The multiples of 9 is 9,18,27,36,45,54,63,72,81,90,99,108,117,126,135...............
The first three multiples of 3 are 3, 6, 9 The first three multiples of 9 are 9, 18, 27 As the lowest common multiples of 3 and 9 is 9, the common multiples of 3 and 9 are the multiples of 9, thus: The first three common multiples of 3 and 9 are 9, 18, 27
The multiples of 9 are: 1 and 9 3 and 3
Common multiples of 9 and 10 are all of the multiples of 90.