This study investigated how 5-year-olds represented groups of objects, and the differences between sex and socioeconomic status. Thirty-seven 5-year-olds were asked to write down the quantity of three clips, five magnets, and seven stones for the purpose of communication. Their representations were analyzed. The results showed that most 5-year-olds used written numerical symbols to represent quantity. Girls and children from higher- and middle-socioeconomic status had sophisticated type of quantity representation. The results were discussed and implications regarding education and future research were presented.