Printable primary math worksheet for math grades 1 to 6 based on ... - Free Printable
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Step-by-step solution for: Printable primary math worksheet for math grades 1 to 6 based on ...
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Show Answer Key & Explanations
Step-by-step solution for: Printable primary math worksheet for math grades 1 to 6 based on ...
Let's solve the problem step by step.
Estimate the sums by rounding off each number to the nearest ten, then add the rounded numbers.
---
To round a number to the nearest ten:
- Look at the ones digit.
- If it’s 5 or more, round up.
- If it’s less than 5, round down.
For example:
- 53 → 50 (because 3 < 5)
- 17 → 20 (because 7 ≥ 5)
Then add the rounded numbers.
---
Now, let’s go through each problem:
---
1. 53 + 17 ≈ 50 + 20 ≈ 70 ✔ (Given as an example)
2. 44 + 15
- 44 → 40
- 15 → 20
- 40 + 20 = 60
→ 40 + 20 ≈ 60
3. 65 + 34
- 65 → 70
- 34 → 30
- 70 + 30 = 100
→ 70 + 30 ≈ 100
4. 47 + 58
- 47 → 50
- 58 → 60
- 50 + 60 = 110
→ 50 + 60 ≈ 110
5. 31 + 18
- 31 → 30
- 18 → 20
- 30 + 20 = 50
→ 30 + 20 ≈ 50
6. 84 + 52
- 84 → 80
- 52 → 50
- 80 + 50 = 130
→ 80 + 50 ≈ 130
7. 56 + 78
- 56 → 60
- 78 → 80
- 60 + 80 = 140
→ 60 + 80 ≈ 140
8. 57 + 23
- 57 → 60
- 23 → 20
- 60 + 20 = 80
→ 60 + 20 ≈ 80
9. 69 + 33
- 69 → 70
- 33 → 30
- 70 + 30 = 100
→ 70 + 30 ≈ 100
10. 65 + 58
- 65 → 70
- 58 → 60
- 70 + 60 = 130
→ 70 + 60 ≈ 130
11. 72 + 58
- 72 → 70
- 58 → 60
- 70 + 60 = 130
→ 70 + 60 ≈ 130
12. 51 + 59
- 51 → 50
- 59 → 60
- 50 + 60 = 110
→ 50 + 60 ≈ 110
13. 57 + 15
- 57 → 60
- 15 → 20
- 60 + 20 = 80
→ 60 + 20 ≈ 80
14. 34 + 38
- 34 → 30
- 38 → 40
- 30 + 40 = 70
→ 30 + 40 ≈ 70
15. 61 + 69
- 61 → 60
- 69 → 70
- 60 + 70 = 130
→ 60 + 70 ≈ 130
16. 89 + 89
- 89 → 90
- 89 → 90
- 90 + 90 = 180
→ 90 + 90 ≈ 180
17. 88 + 12
- 88 → 90
- 12 → 10
- 90 + 10 = 100
→ 90 + 10 ≈ 100
18. 75 + 58
- 75 → 80
- 58 → 60
- 80 + 60 = 140
→ 80 + 60 ≈ 140
19. 92 + 29
- 92 → 90
- 29 → 30
- 90 + 30 = 120
→ 90 + 30 ≈ 120
20. 51 + 19
- 51 → 50
- 19 → 20
- 50 + 20 = 70
→ 50 + 20 ≈ 70
21. 41 + 35
- 41 → 40
- 35 → 40
- 40 + 40 = 80
→ 40 + 40 ≈ 80
22. 53 + 65
- 53 → 50
- 65 → 70
- 50 + 70 = 120
→ 50 + 70 ≈ 120
---
| Problem | Rounded | Sum |
|--------|--------|-----|
| 44 + 15 | 40 + 20 ≈ 60 |
| 65 + 34 | 70 + 30 ≈ 100 |
| 47 + 58 | 50 + 60 ≈ 110 |
| 31 + 18 | 30 + 20 ≈ 50 |
| 84 + 52 | 80 + 50 ≈ 130 |
| 56 + 78 | 60 + 80 ≈ 140 |
| 57 + 23 | 60 + 20 ≈ 80 |
| 69 + 33 | 70 + 30 ≈ 100 |
| 65 + 58 | 70 + 60 ≈ 130 |
| 72 + 58 | 70 + 60 ≈ 130 |
| 51 + 59 | 50 + 60 ≈ 110 |
| 57 + 15 | 60 + 20 ≈ 80 |
| 34 + 38 | 30 + 40 ≈ 70 |
| 61 + 69 | 60 + 70 ≈ 130 |
| 89 + 89 | 90 + 90 ≈ 180 |
| 88 + 12 | 90 + 10 ≈ 100 |
| 75 + 58 | 80 + 60 ≈ 140 |
| 92 + 29 | 90 + 30 ≈ 120 |
| 51 + 19 | 50 + 20 ≈ 70 |
| 41 + 35 | 40 + 40 ≈ 80 |
| 53 + 65 | 50 + 70 ≈ 120 |
---
You estimate by rounding each number to the nearest ten, then adding them. This gives you a quick approximation of the actual sum.
Let me know if you'd like this printed or formatted for a worksheet!
Task:
Estimate the sums by rounding off each number to the nearest ten, then add the rounded numbers.
---
Step-by-step Guide:
To round a number to the nearest ten:
- Look at the ones digit.
- If it’s 5 or more, round up.
- If it’s less than 5, round down.
For example:
- 53 → 50 (because 3 < 5)
- 17 → 20 (because 7 ≥ 5)
Then add the rounded numbers.
---
Now, let’s go through each problem:
---
1. 53 + 17 ≈ 50 + 20 ≈ 70 ✔ (Given as an example)
2. 44 + 15
- 44 → 40
- 15 → 20
- 40 + 20 = 60
→ 40 + 20 ≈ 60
3. 65 + 34
- 65 → 70
- 34 → 30
- 70 + 30 = 100
→ 70 + 30 ≈ 100
4. 47 + 58
- 47 → 50
- 58 → 60
- 50 + 60 = 110
→ 50 + 60 ≈ 110
5. 31 + 18
- 31 → 30
- 18 → 20
- 30 + 20 = 50
→ 30 + 20 ≈ 50
6. 84 + 52
- 84 → 80
- 52 → 50
- 80 + 50 = 130
→ 80 + 50 ≈ 130
7. 56 + 78
- 56 → 60
- 78 → 80
- 60 + 80 = 140
→ 60 + 80 ≈ 140
8. 57 + 23
- 57 → 60
- 23 → 20
- 60 + 20 = 80
→ 60 + 20 ≈ 80
9. 69 + 33
- 69 → 70
- 33 → 30
- 70 + 30 = 100
→ 70 + 30 ≈ 100
10. 65 + 58
- 65 → 70
- 58 → 60
- 70 + 60 = 130
→ 70 + 60 ≈ 130
11. 72 + 58
- 72 → 70
- 58 → 60
- 70 + 60 = 130
→ 70 + 60 ≈ 130
12. 51 + 59
- 51 → 50
- 59 → 60
- 50 + 60 = 110
→ 50 + 60 ≈ 110
13. 57 + 15
- 57 → 60
- 15 → 20
- 60 + 20 = 80
→ 60 + 20 ≈ 80
14. 34 + 38
- 34 → 30
- 38 → 40
- 30 + 40 = 70
→ 30 + 40 ≈ 70
15. 61 + 69
- 61 → 60
- 69 → 70
- 60 + 70 = 130
→ 60 + 70 ≈ 130
16. 89 + 89
- 89 → 90
- 89 → 90
- 90 + 90 = 180
→ 90 + 90 ≈ 180
17. 88 + 12
- 88 → 90
- 12 → 10
- 90 + 10 = 100
→ 90 + 10 ≈ 100
18. 75 + 58
- 75 → 80
- 58 → 60
- 80 + 60 = 140
→ 80 + 60 ≈ 140
19. 92 + 29
- 92 → 90
- 29 → 30
- 90 + 30 = 120
→ 90 + 30 ≈ 120
20. 51 + 19
- 51 → 50
- 19 → 20
- 50 + 20 = 70
→ 50 + 20 ≈ 70
21. 41 + 35
- 41 → 40
- 35 → 40
- 40 + 40 = 80
→ 40 + 40 ≈ 80
22. 53 + 65
- 53 → 50
- 65 → 70
- 50 + 70 = 120
→ 50 + 70 ≈ 120
---
✔ Final Answer Key:
| Problem | Rounded | Sum |
|--------|--------|-----|
| 44 + 15 | 40 + 20 ≈ 60 |
| 65 + 34 | 70 + 30 ≈ 100 |
| 47 + 58 | 50 + 60 ≈ 110 |
| 31 + 18 | 30 + 20 ≈ 50 |
| 84 + 52 | 80 + 50 ≈ 130 |
| 56 + 78 | 60 + 80 ≈ 140 |
| 57 + 23 | 60 + 20 ≈ 80 |
| 69 + 33 | 70 + 30 ≈ 100 |
| 65 + 58 | 70 + 60 ≈ 130 |
| 72 + 58 | 70 + 60 ≈ 130 |
| 51 + 59 | 50 + 60 ≈ 110 |
| 57 + 15 | 60 + 20 ≈ 80 |
| 34 + 38 | 30 + 40 ≈ 70 |
| 61 + 69 | 60 + 70 ≈ 130 |
| 89 + 89 | 90 + 90 ≈ 180 |
| 88 + 12 | 90 + 10 ≈ 100 |
| 75 + 58 | 80 + 60 ≈ 140 |
| 92 + 29 | 90 + 30 ≈ 120 |
| 51 + 19 | 50 + 20 ≈ 70 |
| 41 + 35 | 40 + 40 ≈ 80 |
| 53 + 65 | 50 + 70 ≈ 120 |
---
✔ Summary:
You estimate by rounding each number to the nearest ten, then adding them. This gives you a quick approximation of the actual sum.
Let me know if you'd like this printed or formatted for a worksheet!
Parent Tip: Review the logic above to help your child master the concept of estimation math worksheet.
