Walking to school
Even children who do go to school have to walk for hours to get there.
In Zambia, Grace Simokali, nine, and her younger sister Misozi walk for an hour and a half to get to their school.
They have to leave home early to avoid the heat and arrive three hours before their lessons start.
No money = no school
In Kenya primary education is now free, but parents still have to pay for uniforms, pencils, exercise books and rubbers.
So eight-year-old Eulalia, only gets to go to school if her mum has enough money.
Find out more about what lives are like for kids who have to work instead of going to school on Newsround, Friday 31 January, on BBC One at 5.25pm.