Numbers are used in dates, phone numbers, and quantities. Dates are written with years divided until 19/99, complete from 2000 to 2009, then divided again from 2010. Phone numbers are read in groups of numbers, with one to three numbers per group. Quantities express prices, height, weight, volume, distance, and are spoken in words, such as two thousand one hundred dollars, seven hundred fifty kilometers, one hundred eighty kilograms, and fifty thousand cubic meters.