Mathematics at Rosamond centres on the Victorian Curriculum which is inclusive of all learners, as it covers pre-Foundation curriculum. When students attend a Mainstream school, students are taught the entire Foundation curriculum, most of whom achieve this standard by the end of the year. At Rosamond School, students are assessed using Essential Assessment to determine their level of pre-curriculum that they are working at. These results, coupled with Teacher judgement, are then used to set goals that students work towards for the year. Students receive goals in all areas of the mathematics curriculum; Number and Algebra, Measurement, and Statistics and Probability.

Mathematics lessons at Rosamond often involve the whole body. A multisensory approach is based on whole brain learning, which is the belief that the best way to teach concepts is by involving multiple areas in the brain. An example of this in numeracy is with counting. At Rosamond, we might sing counting songs on the Interactive White Board. We may count jumps on a trampoline, push the amount on a pop-it or even counting down before pulling a party popper. Fun and engaging lessons make for memorable ones.