122/3 is more precise because a third is a smaller measure than a half.
12 mm is the most precise.
23
They are both precise.
23 quarts, because a quart is a smaller unit of measurement.
12 + 23 = 3535 + 54 = 89
cups is less precise.
No. 12 ft is precise, because the definition of 1 ft tells us that it's precisely 12 inches. Incidentally, we're hoping that the question doesn't mean to imply that 178 inches are equal to 12 ft . . .
-23
20 21/32 is more precise.20 21/32 is more precise.20 21/32 is more precise.20 21/32 is more precise.
Both amount to the same length: 12 months = 1 year (January to December).
23
Ounces are more precise.