The Single Category Box The Single Category Box enables a teacher to focus the whole class on learning one particular set of cards. This is ideal for Year 1 to 4 where the 2026 WA Syllabus directs Teachers to teach these specific sets of Number facts. Each box is one particular process e.g. x5. Each Single Category Box contains 40 identical sets of the x5 cards, where each set has 30 flash cards. One Single Category box costs $95 plus $15 delivery.