1. Problem 8: A market stall has 38 apples left, and a box of 148 apples is delivered. We need to find how many apples are on the stall now. 2. Estimation: Round 38 to 40 and 148 to 150. Adding these estimates: $40 + 150 = 190$ apples approximately. 3. Calculation: Add the exact numbers: $38 + 148 = 186$ apples. 4. Problem 9: 359 children and 218 adults visited the play park today. Find how many people visited in total. 5. Estimation: Round 359 to 360 and 218 to 220. Adding the estimates: $360 + 220 = 580$ people approximately. 6. Calculation: Add the exact numbers: $359 + 218 = 577$ people. 7. Problem 10: Estimate the total when adding 414 and 268 using an empty number line. 8. Estimation: Round 414 to 410 and 268 to 270. Adding the estimates: $410 + 270 = 680$ approximately. 9. Number line method: - Start at 414. - Add 200: $414 + 200 = 614$. - Add 60: $614 + 60 = 674$. - Add 8: $674 + 8 = 682$. 10. Final answer: $414 + 268 = 682$. Summary: - Problem 8: 186 apples on the stall. - Problem 9: 577 people visited the park. - Problem 10: Sum is 682 using a number line.