Maddy looks into the start of Sats
Thousands of children have been sitting down in schools across England to take their Sats exams.
The exams have been in the news a lot recently as a lot of teachers have said they don't want to teach them.
In Scotland, Wales and Northern Ireland you don't have to do Sats and there is a lot of talk about getting rid of them, but that hasn't happened yet.
The government has decided to get rid of Sats in science next year, but wants to keep Sats in literacy and numeracy.
Some teachers have already said they could go against the government and ditch all Sats tests in England's schools.
In Scotland, Wales and Northern Ireland children don't have to sit any big tests until they are 15 or 16 years old.