Let's solve each problem step by step from the worksheet titled
"Add whole tens and two 1-digit numbers".
We are to
find the missing numbers in each addition expression. We'll go through each one, simplifying and combining like terms (tens and ones separately when helpful).
---
Problem 1:
6 + 2 + 30 + 90 = ?
Group the tens and ones:
- Tens: 30 + 90 = 120
- Ones: 6 + 2 = 8
- Total: 120 + 8 =
128
✔ Answer: 128
---
Problem 2:
90 + 10 + 9 + 8 = ?
Tens: 90 + 10 = 100
Ones: 9 + 8 = 17
Total: 100 + 17 =
117
✔ Answer: 117
---
Problem 3:
4 + 7 + 90 + 40 = ?
Tens: 90 + 40 = 130
Ones: 4 + 7 = 11
Total: 130 + 11 =
141
✔ Answer: 141
---
Problem 4:
80 + 9 + 5 + 60 = ?
Tens: 80 + 60 = 140
Ones: 9 + 5 = 14
Total: 140 + 14 =
154
✔ Answer: 154
---
Problem 5:
20 + 50 + 7 + 3 = ?
Tens: 20 + 50 = 70
Ones: 7 + 3 = 10
Total: 70 + 10 =
80
✔ Answer: 80
---
Problem 6:
10 + 6 + 5 + 10 = ?
Tens: 10 + 10 = 20
Ones: 6 + 5 = 11
Total: 20 + 11 =
31
✔ Answer: 31
---
Problem 7:
20 + 70 + 7 + 9 = ?
Tens: 20 + 70 = 90
Ones: 7 + 9 = 16
Total: 90 + 16 =
106
✔ Answer: 106
---
Problem 8:
9 + 4 + 30 + 50 = ?
Tens: 30 + 50 = 80
Ones: 9 + 4 = 13
Total: 80 + 13 =
93
✔ Answer: 93
---
Problem 9:
8 + 30 + 9 + 10 = ?
Tens: 30 + 10 = 40
Ones: 8 + 9 = 17
Total: 40 + 17 =
57
✔ Answer: 57
---
Problem 10:
20 + 5 + 9 + 90 = ?
Tens: 20 + 90 = 110
Ones: 5 + 9 = 14
Total: 110 + 14 =
124
✔ Answer: 124
---
Problem 11:
5 + 9 + 60 + 60 = ?
Tens: 60 + 60 = 120
Ones: 5 + 9 = 14
Total: 120 + 14 =
134
✔ Answer: 134
---
Problem 12:
2 + 90 + 8 + 30 = ?
Tens: 90 + 30 = 120
Ones: 2 + 8 = 10
Total: 120 + 10 =
130
✔ Answer: 130
---
Problem 13:
90 + 40 + 3 + 4 = ?
Tens: 90 + 40 = 130
Ones: 3 + 4 = 7
Total: 130 + 7 =
137
✔ Answer: 137
---
Problem 14:
80 + 7 + 3 + 70 = ?
Tens: 80 + 70 = 150
Ones: 7 + 3 = 10
Total: 150 + 10 =
160
✔ Answer: 160
---
✔ Final Answers:
1. 128
2. 117
3. 141
4. 154
5. 80
6. 31
7. 106
8. 93
9. 57
10. 124
11. 134
12. 130
13. 137
14. 160
---
📝 Explanation Summary:
The key strategy is to:
-
Group the tens (numbers ending in 0) together.
-
Group the ones (single-digit numbers) together.
- Add each group separately.
- Then add the totals.
This method helps avoid confusion and makes mental math easier, especially for young learners.
Let me know if you'd like a printable version or a visual explanation!
Parent Tip: Review the logic above to help your child master the concept of addition of whole numbers worksheet for grade 2.
