Expressed as a mixed number in its simplest form, 21/4 / 22/7 = 1 59/88 (one and fifty-nine eighty-eighths). Expressed as a decimal, this is equal to 1.67045 recurring (that is, 1.670454545..)
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That would be 21/4, or 5.25.
12/17 ÷ 4/21 = 63/17 or 312/17
3/7 is.
21 over 4 is 5.25. 2.1 divided by 4 is 0.525.
22/77 ÷ 11/14 = 4/11