1. **State the problem:** We are given the number pattern 698, 683, 670, 659, 650 and need to find the next two numbers. 2. **Identify the pattern:** Look at the differences between consecutive numbers: $$683 - 698 = -15$$ $$670 - 683 = -13$$ $$659 - 670 = -11$$ $$650 - 659 = -9$$ 3. **Analyze the differences:** The differences are decreasing by 2 each time: -15, -13, -11, -9. 4. **Predict the next differences:** Continuing the pattern, the next differences should be: $$-9 + 2 = -7$$ $$-7 + 2 = -5$$ 5. **Calculate the next numbers:** $$650 - 7 = 643$$ $$643 - 5 = 638$$ 6. **Final answer:** The next two numbers in the pattern are **643** and **638**.