Students answer questions correctly to collect treasure from the bottom of the ocean floor. Each piece of treasure is worth different amounts of points. The winner is the person with the most points at the end of the game!

Use this game to reinforce the skill of adding one when mentally adding simple sums to 10. Students will practise recognising number patterns and build fluency with number facts involving +1. Each correct answer helps them collect a valuable piece of treasure, adding an extra layer of excitement as they strengthen their foundational maths skills.

Who will collect the most treasure and become the champion of the sea?

Key Learning Outcomes:

• ✅ Mentally add one to numbers within 10
• ✅ Strengthen automatic recall of basic number facts
• ✅ Develop confidence and fluency with early addition strategies
• ✅ Build number sense through pattern recognition and repeated practise
• ✅ Engage in interactive, competitive gameplay to reinforce learning

How to Play:

1. Students are presented with a simple addition problem that involves adding one to a given number.
2. They must select the correct answer.
3. Each correct answer allows them to collect a piece of treasure from the ocean floor.
4. Each treasure is worth a different number of points.
5. The game continues until all questions have been answered, and the player with the most points wins!

Ideas for Classroom Use:

• 💡 Use during warm-ups or maths rotations to reinforce mental addition strategies
• 💡 Great for Foundation to Year 1 students learning to recognise and recall number facts to 10
• 💡 Pair with number lines or ten frames to provide extra visual support
• 💡 Replay to build confidence, speed and fluency with one more facts

Top Teacher Tips:

• 💛 Let students personalise their experience by choosing from six characters before the game begins
• 💛 Select the number of players or teams at the start of the game to suit individual, paired, or group play
• 💛 Send the QR code home for students to play as a fun way to revise addition at home

Let’s Sail – Mental Maths: Adding 1 builds fluency with early number facts through a fun, treasure-filled challenge beneath the sea!