"The best math online service that I have used... My thumbs up for Sumdog! " (GS, USA)

"My students LOVED sumdog. I have never seen them so eager..." (JT, KY, USA)

“Kids struggling with math facts are enjoying math again... We love Sumdog!” (KW, USA)

"At first math was hard. With sumdog its fun and easy!" (Zecheriah, student, Ohio, USA)

"My students BEG to play. Their speed & accuracy improved in just a few weeks!" (CK,Canada)