1. The first digit in the room numbers in an office block indicates the floor the room is on. For example, Room 503 is on the 5 th floor. a) On which floor is Room 615 ? b) There are stairs that take you from one floor to another. Between the floors, there are 2 flights of stairs. How many flights of stairs do you walk down if you go from Room 408 to Room 112? (2)

**1.** **a) On which floor is Room 615?** - **Answer:** Room 615 is on the **6th floor**. *(The first digit "6" indicates the 6th floor.)* --- **b) How many flights of stairs do you walk down if you go from Room 408 to Room 112?** - **Answer:** - **Room 408** is on the **4th floor**. - **Room 112** is on the **1st floor**. You are moving down **3 floors** (from 4th to 1st). Since there are **2 flights of stairs between each floor**, you walk down: **3 floors × 2 flights per floor = 6 flights of stairs.** **Total:** You walk down **6 flights of stairs**.