21, 42, 63, 84, 105.
Factors: 1, 3, 7, 21 Multiples: 21, 42, 63, 84 and so on.
Example: 5 and 7 List the multiples of 5. 5, 10, 15, 20, 25, 30, 35, 40... List the multiples of 7. 7, 14, 21, 28, 35, 42... The LCM is the first number that appears on both lists.
Since 10 is a multiple of 5, all multiples of 10 are multiples of 5.
Multiples of 50 are the only numbers that are both. All other multiples of 5 aren't.
The first 5 multiples of 21 are: 21, 42, 63, 84, and 105.
The first 5 multiples of 21 are: 21, 42, 63, 84, and 105.
1 21370
21, 42, 63, 84, 105.
-16
7, 14, 21, 28, 35
They are: 7 14 21 28 and 35
14 21 28 35 42
There are 179 multiples of 5 between 101 and 999. 101 ÷ 5 = 201/5 → first multiple of 5 ≥ 101 is 21 x 5 999 ÷ 5 = 1994/5 → last multiple of 5 ≤ 999 is 199 x 5 → number of multiples of 5 between 101 and 999 is 199 - 21 + 1 = 179.
7, 14, 21, 28, 35
Multiples 21: 1,3,7,21Multiples 49: 1,7,49
LCM of 21 & 49 is 147, so all multiples of 147 are common multiples of 21 & 49.