It is 21x.
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Since the prime factors of 21 are 3 x 7 and the prime factors of 8 are 2 x 2 x 2, 21/8 is already in simplest form. However, it may be preferable to express the number in mixed form, two and five eighths, or in decimal form, 2.625.
21/5 is the simplest form.
21/100 is the simplest form.
8/21 is the simplest form.
13/21 is in its simplest form.