Clever Near Doubles
šµļøāāļø Use your doubles knowledge like a detective! If you know a double fact, you can solve the problems right next to it. We call these "near doubles" or "neighbors of doubles".
Concept
This is a super smart trick to solve addition problems that are close to a double you already know. **The "Doubles Plus One" Strategy** Let's solve **6 + 7**. 1. **Find the smaller number:** It's 6. 2. **Think of its double:** You know that **6 + 6 = 12**. 3. **Realize the relationship:** The problem 6 + 7 is just ONE MORE than 6 + 6. 4. **Solve:** So, the answer must be one more than 12. It's 13! * **6 + 7 = 13** **The "Doubles Minus One" Strategy** Let's solve **8 + 7**. 1. **Find the bigger number:** It's 8. 2. **Think of its double:** You know that **8 + 8 = 16**. 3. **Realize the relationship:** The problem 8 + 7 is just ONE LESS than 8 + 8. 4. **Solve:** So, the answer must be one less than 16. It's 15! * **8 + 7 = 15** Both strategies give you the right answer! You can choose whichever one makes more sense to you.
Try it
Let's be a near-doubles detective! **Instructions:** Use the double fact to help you solve the near-double problem. **Problem 1:** You know **5 + 5 = 10**. So, what is **5 + 6**? ___ **Problem 2:** You know **7 + 7 = 14**. So, what is **7 + 8**? ___ **Problem 3:** You know **8 + 8 = 16**. So, what is **8 + 7**? ___ **Problem 4:** You know **6 + 6 = 12**. So, what is **6 + 5**? ___ **Problem 5:** Solve **9 + 8** using a near-doubles strategy. Show your thinking! š **Three Numbers Challenge:** How can you use doubles to solve **4 + 4 + 1**? * First solve the double: 4 + 4 = ___ * Then add the 1: ___ + 1 = ___