81
54
The multiples of 4 that are less than 30 are 4, 8, 12, 16, 20, 24, 28. So the greatest multiple of 4 that is less than 30 is 28.
Multiples of 9 less than 70 are: 9, 18, 27, 36, 45, 54, 63. So the greatest multiple of 9 that is less than 70 is 63.
It is: 8*7 = 56
81
54
It is: 48
The multiples of 4 that are less than 30 are 4, 8, 12, 16, 20, 24, 28. So the greatest multiple of 4 that is less than 30 is 28.
Multiples of 9 less than 70 are: 9, 18, 27, 36, 45, 54, 63. So the greatest multiple of 9 that is less than 70 is 63.
66
There are four of them...
It is: 8*7 = 56
56.
None. The greatest common multiple of any set of integers is infinite.
1001
None. You can't have an LCM less than a GCF.