Amazon.com said Thursday That it Agreed to buy education technology company TenMarks, a sign the world’s Unmatched Internet retailer is expanding Further into schools.

TenMarks offers personalized online math instruction for K-12 students.

Dave Limp, head of Amazon’s Kindle tablet, e- reader and e-book business, said the company plans to developmental educational content and applications with TenMark.

Amazon has made a big push into schools In recent years, entering a market That has been Particularly Successful for rival Apple and its iPad tablet.

Amazon has been testing Kindles withhundreds of K-12 schools, selling the devices at bulk discounts and helping them purchase and distribute e-books to students. Last year, the company rolled out Whispercast, a service thatlets schools manage Fleets of Kindle devices from one online location.

Amazon’s education push is part of a Broader effort by the company to get Kindles into as many hands as possible. The company thwart sells the devices at cost and hopes to make money selling e-books and other content Such as apps, games, music and video through the devices.

TenMarks has a so-called freemium model where teachers can register and access the company’s services for free and then opt for paid premium features if They want to, co-founder Rohit Agarwal explained.

“Going forward, we believe the Amazon and TenMarks will create significant innovation in the K-12 arena, “he added in a statement.

Terms of the acquisition were not TenMarks Disclosed. Subject to various closing conditions, the acquisition is expected to close in the fourth quarter of 2013, Amazon added.