Racer has to cycle to school every day. He lives \( 31 / 2 \mathrm{~km} \) from school. How far does he cycle to school and back every week? 49 km

Racer cycles a total of \( 31/2 \text{ km} \) to school and the same distance back home, making his daily round trip \( 31/2 \times 2 = 7 \text{ km} \). Over a week, if he cycles to school 5 days, he would cover \( 7 \text{ km/day} \times 5 \text{ days} = 35 \text{ km} \). That's a healthy distance and keeps him fit and energetic! If Racer ever needs to measure the distance accurately, he might benefit from using a bike computer or a smartphone app that tracks his route. Common mistakes include forgetting to calculate both the to-and-from journey or assuming the distance is the same each day if he takes different routes or stops along the way.