Round numbers are numbers that end in zero, such as 10, 20, 30, etc. The crossword solutions for the term 'round numbers' are eights (6 letters), EROS (4 letters), aughts (6 letters), zeros (5 letters), pars (4 letters), and zeroes (6 letters). Eights, aughts, and zeroes all refer to the same concept of round numbers, while EROS and pars are alternative spellings of the same word. Zeros is another way of referring to round numbers.