Just 90.
Multiples of 20 are 20, 40, 60, 80 and 100. For them to be common, they need to be compared to another set of multiples.
Multiples of 10 include any number ending in zero. For them to be common, they need to be compared to another set of multiples.
10, 20, 30 The common multiples of 5 and 10 are multiples of their lowest common multiple. The lcm of 5 and 10, is 10. Thus the first three common multiples are 10, 20, 30.
Common denominators. These are called "common multiples". For example, multiples of 4 are: 4,8,12,16,20,24 ... . Multiples of 6 are: 6,12,18,24,30,36 ... . The numbers on both lists are the common multiples and they include: 12,24,36, ... . Specifically, the smallest number in any such list of common multiples (12 in this example) is known as the Least (or Lowest) Common Multiple or LCM.
10 is.
Multiples of 20 are 20, 40, 60, 80 and 100. For them to be common, they need to be compared to another set of multiples.
Common multiples of 9 and 10 are all of the multiples of 90.
The common multiples of 5 and 10 are: 10, 20, 30,40, .......... the least common multiple is 10
Multiples of 10 include any number ending in zero. For them to be common, they need to be compared to another set of multiples.
Each common multiple of 9 and 10 occurs exactly once (in the list of common multiples), so there is no common multiple that occurs the most. All common multiples of 9 and 10 are the multiples of their least common multiple which is 90.
10, 20, 30 The common multiples of 5 and 10 are multiples of their lowest common multiple. The lcm of 5 and 10, is 10. Thus the first three common multiples are 10, 20, 30.
The two smallest multiples of 10 are 10 and 20. For them to be common, they would need to be compared to another set of multiples.
The common multiples of 10 and 16 are 80, 160, 240 and so on.
Multiples of 90.
Common denominators. These are called "common multiples". For example, multiples of 4 are: 4,8,12,16,20,24 ... . Multiples of 6 are: 6,12,18,24,30,36 ... . The numbers on both lists are the common multiples and they include: 12,24,36, ... . Specifically, the smallest number in any such list of common multiples (12 in this example) is known as the Least (or Lowest) Common Multiple or LCM.
Multiples of 90
A word problem that involves common multiples could be, "Whatare the common multiples of 10 and 15?"