We define the multiples of 21/15 as the product of any integer multiplied by 21/15. Therefore, to create a list of multiples of 21/15 we start by multiplying 21/15 by one, then we multiply 21/15 by two, then we multiply 21/15 by three, and so on.
To multiply a fraction by an integer, we leave the denominator alone and multiply the numerator by the integer. It is impossible to give you a list of all multiples of 21/15 because the list goes on forever. However, here is the math to calculate the beginning list of multiples of 21/15.
21/15 × 1 = 21/15
21/15 × 2 = 42/15
21/15 × 4 = 63/15
21/15 × 4 = 84/15
21/15 × 5 = 105/15
21/15 × 6 = 126/15
21/15 × 7 = 147/15
21/15 × 8 = 168/15
21/15 × 9 = 189/15
21/15 × 10 = 210/15
21/15 × 11 = 231/15
21/15 × 12 = 252/15
We have simplified the fractions above for you. Below are the multiples of 21/15 in their lowest possible terms:21/15 = 1 2/5
42/15 = 2 4/5
63/15 = 4 1/5
84/15 = 5 3/5
105/15 = 7
126/15 = 8 2/5
147/15 = 9 4/5
168/15 = 11 1/5
189/15 = 12 3/5
210/15 = 14
231/15 = 15 2/5
252/15 = 16 4/5
As we stated above, the list of multiples of 21/15 goes on forever because the product of 21/15 multiplied by any whole number (integer) is a multiple of 21/15.
You can also create a list of multiples of 21/15 if you keep adding 21/15 like this:21/15
21/15 + 21/15 = 42/15
21/15 + 21/15 + 21/15 = 63/15
21/15 + 21/15 + 21/15 + 21/15 = 84/15
∞
Again, the list can go on forever, because you can continue adding 21/15 to the list. Therefore, the list of multiples of 21/15 is ∞ (infinite).
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