1. The problem is to round each given number to the nearest thousand. 2. To round to the nearest thousand, look at the hundreds digit: - If it is 5 or more, round up. - If it is less than 5, round down. 3. For ① 19503: - The hundreds digit is 5 (in 503). - Since it is 5, round up. - So, 19503 rounds to 20000. 4. For ② 25006: - The hundreds digit is 0 (in 006). - Since it is less than 5, round down. - So, 25006 rounds to 25000. 5. For ③ 4517: - The hundreds digit is 5 (in 517). - Since it is 5, round up. - So, 4517 rounds to 5000. 6. For ④ 9785: - The hundreds digit is 7 (in 785). - Since it is more than 5, round up. - So, 9785 rounds to 10000. Final answers: ① 19503 → 20000 ② 25006 → 25000 ③ 4517 → 5000 ④ 9785 → 10000