SoftBank followed up a $1.4m seed investment in the mathematics learning company last year by leading its series A round this time around.

KnowRe, a South Korea-based education technology company for mathematics in US schools, has raised $6.8m in a series A round led by existing investor SoftBank Ventures Korea (SBVK).

SBVK, a corporate venturing firm affiliated with Japan-based internet conglomerate SoftBank, was joined in the round by investors including venture capital firms KTB Network, Partners Investment and SparkLabs Global Ventures.

SBVK also contributed the $1.4m raised by KnowRe for its seed round in January 2013.

KnowRe has developed a cloud-based adaptive learning…