Let's solve each of these
mental math addition problems step by step. The goal is to add the numbers quickly and accurately using mental strategies such as breaking numbers into tens and ones, or adding in parts.
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Left Column:
1.
15 + 13
→ 10 + 10 = 20, 5 + 3 = 8 → 20 + 8 =
28
2.
16 + 22
→ 10 + 20 = 30, 6 + 2 = 8 → 30 + 8 =
38
3.
31 + 16
→ 30 + 10 = 40, 1 + 6 = 7 → 40 + 7 =
47
4.
25 + 12
→ 20 + 10 = 30, 5 + 2 = 7 → 30 + 7 =
37
5.
52 + 31
→ 50 + 30 = 80, 2 + 1 = 3 → 80 + 3 =
83
6.
10 + 5
→ Simple:
15
7.
15 + 4
→ 15 + 4 =
19
8.
25 + 11
→ 25 + 10 = 35, +1 =
36
9.
36 + 20
→ 36 + 20 =
56
10.
49 + 10
→ 49 + 10 =
59
11.
15 + 10
→ 15 + 10 =
25
12.
68 + 11
→ 68 + 10 = 78, +1 =
79
13.
56 + 23
→ 50 + 20 = 70, 6 + 3 = 9 → 70 + 9 =
79
14.
24 + 22
→ 20 + 20 = 40, 4 + 2 = 6 → 40 + 6 =
46
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Right Column:
15.
44 + 11
→ 44 + 10 = 54, +1 =
55
16.
70 + 22
→ 70 + 20 = 90, +2 =
92
17.
12 + 15
→ 10 + 10 = 20, 2 + 5 = 7 → 20 + 7 =
27
18.
11 + 3
→ 11 + 3 =
14
19.
20 + 8
→ 20 + 8 =
28
20.
32 + 33
→ 30 + 30 = 60, 2 + 3 = 5 → 60 + 5 =
65
21.
70 + 23
→ 70 + 20 = 90, +3 =
93
22.
56 + 10
→ 56 + 10 =
66
23.
35 + 10
→ 35 + 10 =
45
24.
88 + 11
→ 88 + 10 = 98, +1 =
99
25.
45 + 14
→ 40 + 10 = 50, 5 + 4 = 9 → 50 + 9 =
59
26.
34 + 35
→ 30 + 30 = 60, 4 + 5 = 9 → 60 + 9 =
69
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✔ Final Answers:
Left Column:
1. 15 + 13 =
28
2. 16 + 22 =
38
3. 31 + 16 =
47
4. 25 + 12 =
37
5. 52 + 31 =
83
6. 10 + 5 =
15
7. 15 + 4 =
19
8. 25 + 11 =
36
9. 36 + 20 =
56
10. 49 + 10 =
59
11. 15 + 10 =
25
12. 68 + 11 =
79
13. 56 + 23 =
79
14. 24 + 22 =
46
Right Column:
15. 44 + 11 =
55
16. 70 + 22 =
92
17. 12 + 15 =
27
18. 11 + 3 =
14
19. 20 + 8 =
28
20. 32 + 33 =
65
21. 70 + 23 =
93
22. 56 + 10 =
66
23. 35 + 10 =
45
24. 88 + 11 =
99
25. 45 + 14 =
59
26. 34 + 35 =
69
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💡 Tips for Mental Math:
- Break numbers into tens and ones.
- Add tens first, then ones.
- Use rounding (e.g., 11 is 10 + 1).
- Practice regularly to improve speed and accuracy.
Let me know if you'd like a printable version or a worksheet format! 😊
Parent Tip: Review the logic above to help your child master the concept of mental addition worksheet.
