I'll solve this rounding worksheet step by step.
Let me work through each problem carefully:
Understanding the task: Round 3-digit numbers to the nearest 10 or 100 based on which digit is underlined.
Rule for rounding:
- Look at the digit to the RIGHT of the underlined digit
- If that digit is 5 or more, round UP
- If that digit is 4 or less, round DOWN (keep the underlined digit the same)
- Change all digits to the right to zeros
Let me solve each one:
1.
255 - underline on 5 (tens place). Look at ones digit: 5. Since 5 ≥ 5, round up. 255 → 260
2.
367 - underline on 6 (tens place). Look at ones digit: 7. Since 7 ≥ 5, round up. 367 → 370
3.
309 - underline on 0 (tens place). Look at ones digit: 9. Since 9 ≥ 5, round up. 309 → 310
4.
962 - underline on 6 (tens place). Look at ones digit: 2. Since 2 < 5, round down. 962 → 960
5.
383 - underline on 8 (tens place). Look at ones digit: 3. Since 3 < 5, round down. 383 → 380
6.
690 - underline on 9 (tens place). Look at ones digit: 0. Since 0 < 5, round down. 690 → 690
7.
115 - underline on 1 (hundreds place). Look at tens digit: 1. Since 1 < 5, round down. 115 → 100
8.
785 - underline on 8 (tens place). Look at ones digit: 5. Since 5 ≥ 5, round up. 785 → 790
9.
317 - underline on 1 (tens place). Look at ones digit: 7. Since 7 ≥ 5, round up. 317 → 320
10.
604 - underline on 0 (tens place). Look at ones digit: 4. Since 4 < 5, round down. 604 → 600
11.
826 - underline on 2 (tens place). Look at ones digit: 6. Since 6 ≥ 5, round up. 826 → 830
12.
484 - underline on 8 (tens place). Look at ones digit: 4. Since 4 < 5, round down. 484 → 480
13.
636 - underline on 3 (tens place). Look at ones digit: 6. Since 6 ≥ 5, round up. 636 → 640
14.
859 - underline on 5 (tens place). Look at ones digit: 9. Since 9 ≥ 5, round up. 859 → 860
15.
399 - underline on 9 (tens place). Look at ones digit: 9. Since 9 ≥ 5, round up. 399 → 400
16.
431 - underline on 4 (hundreds place). Look at tens digit: 3. Since 3 < 5, round down. 431 → 400
17.
583 - underline on 8 (tens place). Look at ones digit: 3. Since 3 < 5, round down. 583 → 580
18.
618 - underline on 1 (tens place). Look at ones digit: 8. Since 8 ≥ 5, round up. 618 → 620
19.
628 - underline on 2 (tens place). Look at ones digit: 8. Since 8 ≥ 5, round up. 628 → 630
20.
925 - underline on 2 (tens place). Look at ones digit: 5. Since 5 ≥ 5, round up. 925 → 930
21.
224 - underline on 2 (hundreds place). Look at tens digit: 2. Since 2 < 5, round down. 224 → 200
Final Answer:
1. 260
2. 370
3. 310
4. 960
5. 380
6. 690
7. 100
8. 790
9. 320
10. 600
11. 830
12. 480
13. 640
14. 860
15. 400
16. 400
17. 580
18. 620
19. 630
20. 930
21. 200
Parent Tip: Review the logic above to help your child master the concept of rounding worksheet for 2nd grade.
