Printable primary math worksheet for math grades 1 to 6 based on ... - Free Printable

Let's solve each of the decimal addition and subtraction problems step by step. We'll use the rules for adding and subtracting positive and negative numbers:

Rules to Remember:

- Adding a negative number is the same as subtracting a positive number.
- Example: $ a + (-b) = a - b $
- Subtracting a negative number is the same as adding a positive number.
- Example: $ a - (-b) = a + b $
- When adding or subtracting decimals, align the decimal points and apply the sign rules.

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Now let’s go through each problem one by one:

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Row 1:
1. $ 0.9 - (-1.3) = 0.9 + 1.3 = 2.2 $
2. $ -0.9 + 1.6 = 0.7 $
3. $ 3.1 + (-1.3) = 3.1 - 1.3 = 1.8 $

Row 2:
4. $ 1.3 + (-2.5) = 1.3 - 2.5 = -1.2 $
5. $ -0.9 + 1.2 = 0.3 $
6. $ 4.4 - (-1.8) = 4.4 + 1.8 = 6.2 $

Row 3:
7. $ -4.2 + 5.2 = 1.0 $
8. $ -0.2 - (-4.2) = -0.2 + 4.2 = 4.0 $
9. $ -1.2 + 1.3 = 0.1 $

Row 4:
10. $ -1.5 - (-2.3) = -1.5 + 2.3 = 0.8 $
11. $ 0.3 + 3.5 = 3.8 $
12. $ -6.1 - (-1.7) = -6.1 + 1.7 = -4.4 $

Row 5:
13. $ -0.8 + 1.4 = 0.6 $
14. $ 0.2 - (-4.1) = 0.2 + 4.1 = 4.3 $
15. $ -0.3 + 1.6 = 1.3 $

Row 6:
16. $ 4.1 - (-1.3) = 4.1 + 1.3 = 5.4 $
17. $ -1.4 + 2.6 = 1.2 $
18. $ 4.9 - (-1.6) = 4.9 + 1.6 = 6.5 $

Row 7:
19. $ 3.5 + (-1.9) = 3.5 - 1.9 = 1.6 $
20. $ -2.6 + 1.8 = -0.8 $
21. $ 3.1 + (-1.5) = 3.1 - 1.5 = 1.6 $

Row 8:
22. $ -5.1 + 1.4 = -3.7 $
23. $ 1.8 + (-1.5) = 1.8 - 1.5 = 0.3 $
24. $ -5.4 + 2.5 = -2.9 $

Row 9:
25. $ -5.9 - (-1.2) = -5.9 + 1.2 = -4.7 $
26. $ -0.3 + 1.7 = 1.4 $
27. $ -5.2 - (-6.3) = -5.2 + 6.3 = 1.1 $

Row 10:
28. $ -0.9 + (-6.6) = -0.9 - 6.6 = -7.5 $
29. $ -3.2 - (-1.7) = -3.2 + 1.7 = -1.5 $
30. $ -0.7 + (-1.7) = -0.7 - 1.7 = -2.4 $

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Final Answers (in order):

```
2.2 0.7 1.8
-1.2 0.3 6.2
1.0 4.0 0.1
0.8 3.8 -4.4
0.6 4.3 1.3
5.4 1.2 6.5
1.6 -0.8 1.6
-3.7 0.3 -2.9
-4.7 1.4 1.1
-7.5 -1.5 -2.4
```

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✔ Explanation Summary:

- Always remember: Minus a negative becomes plus a positive.
- Plus a negative becomes minus a positive.
- Perform operations carefully with decimals — keep decimal points aligned.
- Use number line logic if needed: moving right for positive, left for negative.

Let me know if you'd like this in a printable format or with explanations for individual problems!