The following addition puzzle will help to improve your mathematical and logical thinking skills.
Complete the sum by swapping the digits and change the cells to white. Sounds easy, but can get quite tricky especially at the higher levels. Test your skills with other players online.
Rotate to landscape screen format on a mobile phone or small tablet to use the Mathway widget, a free math problem solver that answers your questions with step-by-step explanations.
We welcome your feedback, comments and questions about this site or page. Please submit your feedback or enquiries via our Feedback page.