This chapter from the K cohort of Growing Up in Australia: The Longitudinal Study of Australian Children, examines the numeracy skills demonstrated by children at different ages, and whether levels of numeracy skills vary for children from different socio-demographic backgrounds.
The socio-demographic groups examined in this chapter are categorised by:
child gender; 
socio-economic characteristics: – family socio-economic position (SEP) - lowest 25%, middle 50%, highest 25%; and80
Australian Institute of Family Studies – mother’s working hours—not working (including those unemployed, on maternity leave,  and not in the labour force), working less than 35 hours per week, or working 35 hours or  more per week; and 
family characteristics: – family type—two-parent family, lone-mother family; and – number of siblings in the household—no siblings, one or two siblings, three or more siblings.