Numberjacks is a British animated and live-action children's television series, aimed particularly at children aged 2 to 5, which was formerly shown on CBeebies and occasionally on BBC Two in the United Kingdom. It was also shown on Tiny Pop until 2016. It was produced by Open Mind Productions for the BBC and features a mixture of computer-generated animation and live-action. 67 episodes were produced. The show focuses on mathematics.

Numberjacks centres on the adventures of a group of anthropomorphic numbers. The main Numberjacks, Three, Four, Five, and Six, are the main protagonists of the series. They normally spend their everyday lives inside a sofa until a call comes in from real-life child Agents, who report problems that need solving. One or two of the Numberjacks fly out on location to investigate the issues, that are normally caused by the show's main antagonists - the Meanies. After much fun, adventure and powerful thinking, the Numberjacks win the day – until next time.

There are six recurring Numberjacks, the younger ones do not go on missions but occasionally cause trouble, while the elder ones go on their own missions.

When a meanie is defeated, the end of their theme song will play; this happens in most episodes, but not all of them.

Series 1, consisting of 45 15-minute episodes, first aired in autumn 2006. Series 2, consisting of 20 15-minute episodes first aired on CBeebies in 2009.

The Numberjacks Are On Their Way! (Volume 1)

Calling All Agents! (Volume 2)

Standing By To Zoom! (Volume 3)