Subjects arithmetic

Add 15 6 137E61

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**Problem:** $15 + 6 = ?$ **Count and add:** **Group 1 (15 stars):** ⭐ ⭐ ⭐ ⭐ ⭐ ⭐ ⭐ ⭐ ⭐ ⭐ ⭐ ⭐ ⭐ ⭐ ⭐ ➕ **PLUS** **Group 2 (6 stars):** ⭐ ⭐ ⭐ ⭐ ⭐ ⭐ **Count all together:** ⭐ ⭐ ⭐ ⭐ ⭐ ⭐ ⭐ ⭐ ⭐ ⭐ ⭐ ⭐ ⭐ ⭐ ⭐ ⭐ ⭐ ⭐ ✨ **Total: 21 stars!** **Math:** $$15 + 6 = 21$$