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Reward stickers come in three sizes and every sheet costs R50, so the only question is how many you want per sheet: 140 at 18mm, 63 at 27mm, or 35 at 38mm. For most classrooms 27mm is the sensible middle — readable across a desk, and still 63 stickers for your fifty rand.
That is the short answer. What follows is the reasoning, because the right size depends less on the sticker than on where it ends up. A reward sticker has one of three jobs, and each one wants a different size.
Match the size to the surface
| Size | Where it works | Per R50 sheet |
|---|---|---|
| 18mm | Margins, homework diaries, anywhere space is tight | 140 |
| 27mm | The everyday one — exercise books, worksheets, hands | 63 |
| 38mm | Charts, lapels and certificates — anything read across a room | 35 |