300
600
900
are some
29 of them.
42 72
45 multiples of 2 plus 30 multiples of 3 minus 15 multiples of 6 equals 60 numbers
The answer will depend on how many digits there are in each of the 30 numbers. If the 30 numbers are all 6-digit numbers then the answer is NONE! If the 30 numbers are the first 30 counting numbers then there are 126 combinations of five 1-digit numbers, 1764 combinations of three 1-digit numbers and one 2-digit number, and 1710 combinations of one 1-digit number and two 2-digit numbers. That makes a total of 3600 5-digit combinations.
Any multiples of 30 have these three factors. Multiples of 30.
To find the two-digit counting numbers less than 30, we consider the numbers from 10 to 29, which gives us 20 two-digit numbers. The multiples of 20 that are two-digit numbers are 20. Since 20 is already included in the count of two-digit numbers less than 30, the total remains 20. Therefore, there are 20 two-digit counting numbers that are either less than 30 or a multiple of 20.
The first three multiples of 10 are 10, 20 and 30. Since numbers don't stop, there are no last three.
Starting at 12 and ending at 99, there are 30 two-digit numbers divisible by three.
They are 24, 30 and 36
lcm(2, 3, 5) = 30 → 2 digit common multiples are 30, 60, 90.
Multiples of 30 from 120 to 990
There are lots and lots of numbers three-digit numbers that are common multiples of 4 and 6. The first that comes to mind is 600. The lowest such number is 108. The highest is 996.