In Maori medium schools, research that investigates children's mathematical computation with number and connections they might make to mathematical ideas in other strands is limited. This paper seeks to share ideas elicited in a task-based observation and interview with one child about the number ideas she utilises to solve a problem requiring probabilistic thinking. The explanations provided by the child demonstrate how early number and spatial patterns can impact on computation, ease of determining possible outcomes and assigning a numerical probability measure to an event.