180/630 can be multiplied by 0.01111.../0.01111... to simplify it to 2/7. Multiplying by 1, does not change the value of the number, and any number divided by itself equals 1.
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630/30 = 21/1 = 21
11/18
90, 180, 270, 360, 450, 540, 630, . . .
630/810 = 7/9
63/66 = 630/660 is an equivalent fraction. In standard form, 21/22.