Let's solve $21 \div 7$ using ships! 🚢🚢🚢 **Step 1:** Imagine you have 21 ships. Let's show them in groups of 7. **Step 2:** Now, split the 21 ships into groups of 7 ships each. **Box 1:** 🚢 🚢 🚢 🚢 🚢 🚢 🚢 Add ➕ **Box 2:** 🚢 🚢 🚢 🚢 🚢 🚢 🚢 Add ➕ **Box 3:** 🚢 🚢 🚢 🚢 🚢 🚢 🚢 = 21 ships total! **Step 3:** Count how many groups of 7 ships there are. There are 3 groups of 7 ships. So, $21 \div 7 = 3$. Great job! 🎉 You divided 21 ships into 3 equal groups of 7 ships each!