Let's solve the
"Adding whole tens (2 digits)" worksheet step by step. This is a Grade 2 math worksheet where you are adding two numbers that are multiples of 10 (i.e., whole tens). The goal is to find the sum of each pair.
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🔢 Strategy:
When adding whole tens, you can think of it as adding the
tens digits and then appending a zero at the end.
For example:
80 + 60 = ?
Think: 8 + 6 = 14 → So, 80 + 60 =
140
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Now let’s go through each problem:
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1)
80 + 80
→ 8 + 8 = 16 →
160
2)
80 + 60
→ 8 + 6 = 14 →
140
3)
80 + 20
→ 8 + 2 = 10 →
100
4)
30 + 70
→ 3 + 7 = 10 →
100
5)
70 + 60
→ 7 + 6 = 13 →
130
6)
50 + 60
→ 5 + 6 = 11 →
110
7)
50 + 60
→ Same as #6 →
110
8)
40 + 50
→ 4 + 5 = 9 →
90
9)
80 + 70
→ 8 + 7 = 15 →
150
10)
30 + 40
→ 3 + 4 = 7 →
70
11)
10 + 80
→ 1 + 8 = 9 →
90
12)
40 + 60
→ 4 + 6 = 10 →
100
13)
70 + 10
→ 7 + 1 = 8 →
80
14)
70 + 60
→ 7 + 6 = 13 →
130
15)
20 + 80
→ 2 + 8 = 10 →
100
16)
20 + 50
→ 2 + 5 = 7 →
70
17)
80 + 10
→ 8 + 1 = 9 →
90
18)
20 + 40
→ 2 + 4 = 6 →
60
19)
20 + 30
→ 2 + 3 = 5 →
50
20)
30 + 20
→ 3 + 2 = 5 →
50
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✔ Final Answers:
1) 160
2) 140
3) 100
4) 100
5) 130
6) 110
7) 110
8) 90
9) 150
10) 70
11) 90
12) 100
13) 80
14) 130
15) 100
16) 70
17) 90
18) 60
19) 50
20) 50
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📝 Summary:
This worksheet helps students practice mental math with multiples of 10. By focusing on the tens digit and adding them first, children build number sense and fluency in addition.
Let me know if you'd like this formatted as a printable answer sheet!
Parent Tip: Review the logic above to help your child master the concept of 2nd grade homework.
