Hej Matematik ("Hi Mathematics") is a duo from Denmark consisting of Søren Rasted (of Lazyboy and Aqua fame) and his nephew Nicolaj Rasted. The duo published the singles Gymnastik, Centerpubben and Du & Jeg in 2007, all from the album Vi Burde Ses Noget Mere from 2008, published by Copenhagen Records.

In the summer of 2008, they published the single Walkmand, the first single from a yet‑to‑be‑announced second album.

In November 2nd, 2009, Hej Matematik released Party I Provinsen, the lead single of their new album released in Denmark on January 25th, 2010, under the title Alt Går Op I 6.

Their MySpace page is http://myspace.com/hejmatematik, and their official site is http://hejmatematik.dk