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Let's solve the rounding problems step by step based on the rules provided.

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Rounding Rules Recap:

- Rule 1: If the digit to the right of the rounding digit is 1, 2, 3, or 4, round down (keep the rounding digit the same).
- Rule 2: If the digit to the right is 5, 6, 7, 8, or 9, round up (increase the rounding digit by 1).

All digits to the right of the rounding digit become 0.

We are rounding to the nearest 10, so we focus on the tens place and look at the ones digit to decide.

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## ✔ Part 1: Round to the nearest 10 (two-digit numbers)

We'll go through each number:

1.) 47 → Look at ones digit: 7 → ≥5 → round up
→ 47 → 50

2.) 51 → Ones digit: 1 → <5 → round down
→ 51 → 50

3.) 65 → Ones digit: 5 → ≥5 → round up
→ 65 → 70

4.) 22 → Ones digit: 2 → <5 → round down
→ 22 → 20

5.) 43 → Ones digit: 3 → <5 → round down
→ 43 → 40

6.) 99 → Ones digit: 9 → ≥5 → round up
→ 99 → 100

7.) 86 → Ones digit: 6 → ≥5 → round up
→ 86 → 90

8.) 28 → Ones digit: 8 → ≥5 → round up
→ 28 → 30

9.) 77 → Ones digit: 7 → ≥5 → round up
→ 77 → 80

10.) 24 → Ones digit: 4 → <5 → round down
→ 24 → 20

11.) 55 → Ones digit: 5 → ≥5 → round up
→ 55 → 60

12.) 21 → Ones digit: 1 → <5 → round down
→ 21 → 20

13.) 21 → Same as above → 20

14.) 56 → Ones digit: 6 → ≥5 → round up
→ 56 → 60

15.) 94 → Ones digit: 4 → <5 → round down
→ 94 → 90

16.) 88 → Ones digit: 8 → ≥5 → round up
→ 88 → 90

17.) 11 → Ones digit: 1 → <5 → round down
→ 11 → 10

18.) 16 → Ones digit: 6 → ≥5 → round up
→ 16 → 20

19.) 15 → Ones digit: 5 → ≥5 → round up
→ 15 → 20

20.) 33 → Ones digit: 3 → <5 → round down
→ 33 → 30

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✔ Part 2: Round to the nearest 10 (three-digit numbers)

Now we're rounding to the nearest ten, so we focus on the tens digit, and check the ones digit.

1.) 407 → Tens digit: 0, Ones digit: 7 → 7 ≥5 → round up the tens place
→ 407 → 410

2.) 451 → Tens digit: 5, Ones digit: 1 → 1 <5 → keep tens digit same
→ 451 → 450

3.) 635 → Tens digit: 3, Ones digit: 5 → 5 ≥5 → round up tens digit from 3 to 4
→ 635 → 640

4.) 225 → Tens digit: 2, Ones digit: 5 → 5 ≥5 → round up
→ 225 → 230

5.) 432 → Tens digit: 3, Ones digit: 2 → 2 <5 → round down
→ 432 → 430

6.) 929 → Tens digit: 2, Ones digit: 9 → 9 ≥5 → round up
→ 929 → 930

7.) 806 → Tens digit: 0, Ones digit: 6 → 6 ≥5 → round up
→ 806 → 810

8.) 328 → Tens digit: 2, Ones digit: 8 → 8 ≥5 → round up
→ 328 → 330

9.) 677 → Tens digit: 7, Ones digit: 7 → 7 ≥5 → round up
→ 677 → 680

10.) 245 → Tens digit: 4, Ones digit: 5 → 5 ≥5 → round up
→ 245 → 250

11.) 551 → Tens digit: 5, Ones digit: 1 → 1 <5 → round down
→ 551 → 550

12.) 218 → Tens digit: 1, Ones digit: 8 → 8 ≥5 → round up
→ 218 → 220

13.) 291 → Tens digit: 9, Ones digit: 1 → 1 <5 → round down
→ 291 → 290

14.) 556 → Tens digit: 5, Ones digit: 6 → 6 ≥5 → round up
→ 556 → 560

15.) 394 → Tens digit: 9, Ones digit: 4 → 4 <5 → round down
→ 394 → 390

16.) 888 → Tens digit: 8, Ones digit: 8 → 8 ≥5 → round up
→ 888 → 890

17.) 111 → Tens digit: 1, Ones digit: 1 → 1 <5 → round down
→ 111 → 110

18.) 616 → Tens digit: 1, Ones digit: 6 → 6 ≥5 → round up
→ 616 → 620

19.) 125 → Tens digit: 2, Ones digit: 5 → 5 ≥5 → round up
→ 125 → 130

20.) 336 → Tens digit: 3, Ones digit: 6 → 6 ≥5 → round up
→ 336 → 340

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✔ Final Answers:

#### Round to the nearest 10 – Two-digit numbers
1. 47 → 50
2. 51 → 50
3. 65 → 70
4. 22 → 20
5. 43 → 40
6. 99 → 100
7. 86 → 90
8. 28 → 30
9. 77 → 80
10. 24 → 20
11. 55 → 60
12. 21 → 20
13. 21 → 20
14. 56 → 60
15. 94 → 90
16. 88 → 90
17. 11 → 10
18. 16 → 20
19. 15 → 20
20. 33 → 30

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#### Round to the nearest 10 – Three-digit numbers
1. 407 → 410
2. 451 → 450
3. 635 → 640
4. 225 → 230
5. 432 → 430
6. 929 → 930
7. 806 → 810
8. 328 → 330
9. 677 → 680
10. 245 → 250
11. 551 → 550
12. 218 → 220
13. 291 → 290
14. 556 → 560
15. 394 → 390
16. 888 → 890
17. 111 → 110
18. 616 → 620
19. 125 → 130
20. 336 → 340

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✔ Summary of Rounding Rule:

Always look at the digit immediately to the right of the place you're rounding to:
- If it's 0–4, keep the rounding digit.
- If it's 5–9, add one to the rounding digit.
- Replace all digits to the right with 0.

This method applies consistently across all rounding tasks.

Let me know if you'd like a printable version or explanation for any specific problem!