Understanding part–part–total is essential for building early number sense and developing fluency with basic facts. It helps students see that numbers can be broken into parts and recombined in flexible ways - for example, knowing that 7 can be made from 3 and 4, or 5 and 2. This understanding lays the foundation for efficient mental strategies like “make 10,” doubles, and near doubles, rather than relying on rote memorisation. When students grasp part–part–total relationships, they begin to see