We define the multiples of 90/20 as the product of any integer multiplied by 90/20. Therefore, to create a list of multiples of 90/20 we start by multiplying 90/20 by one, then we multiply 90/20 by two, then we multiply 90/20 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 90/20 because the list goes on forever. However, here is the math to calculate the beginning list of multiples of 90/20.
90/20 × 1 = 90/20
90/20 × 2 = 180/20
90/20 × 4 = 270/20
90/20 × 4 = 360/20
90/20 × 5 = 450/20
90/20 × 6 = 540/20
90/20 × 7 = 630/20
90/20 × 8 = 720/20
90/20 × 9 = 810/20
90/20 × 10 = 900/20
90/20 × 11 = 990/20
90/20 × 12 = 1080/20
We have simplified the fractions above for you. Below are the multiples of 90/20 in their lowest possible terms:90/20 = 4 1/2
180/20 = 9
270/20 = 13 1/2
360/20 = 18
450/20 = 22 1/2
540/20 = 27
630/20 = 31 1/2
720/20 = 36
810/20 = 40 1/2
900/20 = 45
990/20 = 49 1/2
1080/20 = 54
As we stated above, the list of multiples of 90/20 goes on forever because the product of 90/20 multiplied by any whole number (integer) is a multiple of 90/20.
You can also create a list of multiples of 90/20 if you keep adding 90/20 like this:90/20
90/20 + 90/20 = 180/20
90/20 + 90/20 + 90/20 = 270/20
90/20 + 90/20 + 90/20 + 90/20 = 360/20
∞
Again, the list can go on forever, because you can continue adding 90/20 to the list. Therefore, the list of multiples of 90/20 is ∞ (infinite).
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Multiples of 90/21
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