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Good quality teaching is key to solving the "global learning crisis" and getting more children confident in their reading and mathematical abilities, Unesco has said.
In their annual report, the UN agency also raised concerns about the number of children missing out on basic schooling and called on nations to "ensure" pupils had "motivated" teachers.
At least 250 million youngsters across the globe are going without a basic education, according to report from the UN.
Unesco's annual monitoring report revealed a "learning crisis" in which a quarter of a billion children did not have basic literacy and numeracy.
The United Nations agency said that more good teachers are needed, and called on governments around the world to provide enough decent, trained teachers to ensure that all children get a good education.
Children in some schools were equally at risk of graduating without being able to read and write well, Unesco warned.
It warned billions of dollars was being spent on poor quality education which risked stifling pupil's learning.