Strategies for Adding 4, 5, and 6
š§ Let's add some powerful new tools to your math toolbox! Instead of just counting, let's learn smart strategies to add 4, 5, and 6 to any number.
Concept
Memorizing is good, but understanding is better! Let's learn how to THINK through these problems. **Strategy for Adding 5:** Five is a friendly number because it's half of 10. We can use 10 as a helper! * **Example: 7 + 5** * Think of 5 as **3 + 2**. * Give 3 to the 7 to make 10! (7 + 3 = 10) * Then add the leftover 2. (10 + 2 = 12). * So, **7 + 5 = 12**. **Strategy for Adding 6:** Six is just "5 and 1 more". * **Example: 8 + 6** * Think of 6 as **5 + 1**. * First, add the 5: **8 + 5 = 13**. * Then, add the extra 1: **13 + 1 = 14**. * So, **8 + 6 = 14**. **Strategy for Adding 4:** Four is like "2 and 2". You can add 2 twice! * **Example: 7 + 4** * Think of 4 as **2 + 2**. * First, add 2: **7 + 2 = 9**. * Add 2 again: **9 + 2 = 11**. * So, **7 + 4 = 11**.
Try it
Let's practice our new strategies! **Instructions:** Solve the problem, and try to use the suggested strategy. **Problem 1 (Adding 5):** Solve **8 + 5**. * Hint: Break 5 into 2 and 3 to help the 8 make 10. * 8 + 2 = 10 * 10 + 3 = ___ **Problem 2 (Adding 6):** Solve **7 + 6**. * Hint: Think of 6 as "5 + 1". * 7 + 5 = 12 * 12 + 1 = ___ **Problem 3 (Adding 4):** Solve **9 + 4**. * Hint: Think of 4 as "2 + 2". * 9 + 2 = 11 * 11 + 2 = ___ **Your Turn! Choose any strategy.** 4. 6 + 5 = ___ 5. 8 + 4 = ___ 6. 9 + 6 = ___ š **Three Numbers Challenge:** How would you solve **5 + 4 + 5**? * Hint: Can you find a double first? (5+5) * (5 + 5) + 4 = ? * 10 + 4 = ___