"Arithmetic" is a single by Brooke Fraser released in 2004. The song is the first track Fraser's debut album What To Do With Daylight, which takes its name from this song in the line "Wondering what to do with daylight until I can make you mine." The song was later included on the Sony BMG compilation More Nature, a collection of songs from the New Zealand Sony BMG catalogue (in particular, those who promote nature and conservation).

The song debuted on the New Zealand Singles Chart at number thirty eight on 26 July 2004 and peaked at number eight. It spent nineteen weeks on the chart.

The film clip for "Arithmetic" features Fraser in a dimly lit studio surrounded by fairy lights and with fairy lights all over her piano. As the song only features piano and a string quartet, the quartet is also visible in another part of the studio with their music stands also lit by fairy lights. For this abundance of fairy lights, "Arithmetic" was awarded the satirical award for "Most used fairy lights in a video clip" in the 2004 Studio 2 Awards.

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