Because all of those numbers are divisible by 21.
The first five multiples of 21 are: 21, 42, 63, 84, 105.
21, 42, 63, 84, 105.
42 63 84 105 126 147
21, 42, 63, 84, 105, 126, 147, 168, 189, 210
21, 42, 63, 84, 105, 126, 147, 168, 189, 210
The first 5 multiples of 21 are: 21, 42, 63, 84, and 105.
The first five multiples of 21 are: 21, 42, 63, 84, 105.
The first 5 multiples of 21 are: 21, 42, 63, 84, and 105.
21, 42, 63, 84, 105.
21, 42, 63, 84, 105, 126 . . .
21,42,64,86,108,130,152,174,196,218They are 21, 42, 63, 84, 105, 126, 147, 168, 189, 210.
Factors of 21 = 1, 3, 7, 21 Multiples of 21: 21, 42, 63, 84, 105, 126, 147 +21 . . .
42 63 84 105 126 147
Multiples of 21 are numbers that can be divided evenly by 21. The first few multiples of 21 are 21, 42, 63, 84, 105, and so on. To find more multiples of 21, you can continue adding 21 to the previous multiple.
Factors: 1, 3, 7, 21. Multiples: 21, 42, 63, 84, 105, 126, 147, 168, 189, 210 +21 . . .
21, 42, 63, 84, 105, 126, 147, 168, 189, 210, 231, . . .
21, 42, 63, 84, 105, 126, 147, 168, 189, 210.