This worksheet challenges students to find the missing number in subtraction equations involving decimals to one decimal place.

Let's solve the "Subtracting Decimals to 1DP Sheet 3" step by step. The goal is to find the missing number in each subtraction problem, where all numbers are decimals with one decimal place (tenths). We’ll use basic subtraction and sometimes think in reverse: if $ a - b = c $, then $ b = a - c $.

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🔢 General Strategy:

For problems like:
- $ A - \_\_ = B $
We can rearrange to:
- $ \_\_ = A - B $

Similarly, for:
- $ \_\_ - A = B $
Then:
- $ \_\_ = A + B $

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Let’s go through each problem:

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Column 1 (Problems 1–20)

1) $ 0.5 - \_\_ = 0.2 $ → $ 0.5 - 0.2 = 0.3 $ → 0.3

2) $ 0.8 - \_\_ = 0.6 $ → $ 0.8 - 0.6 = 0.2 $ → 0.2

3) $ 1 - \_\_ = 0.5 $ → $ 1 - 0.5 = 0.5 $ → 0.5

4) $ 0.6 - \_\_ = 0 $ → $ 0.6 - 0 = 0.6 $ → 0.6

5) $ 0.9 - \_\_ = 0.2 $ → $ 0.9 - 0.2 = 0.7 $ → 0.7

6) $ 0.7 - \_\_ = 0.2 $ → $ 0.7 - 0.2 = 0.5 $ → 0.5

7) $ 1.3 - \_\_ = 1.1 $ → $ 1.3 - 1.1 = 0.2 $ → 0.2

8) $ 1.5 - \_\_ = 1 $ → $ 1.5 - 1 = 0.5 $ → 0.5

9) $ 1.2 - \_\_ = 0.7 $ → $ 1.2 - 0.7 = 0.5 $ → 0.5

10) $ 1.1 - \_\_ = 0.2 $ → $ 1.1 - 0.2 = 0.9 $ → 0.9

11) $ \_\_ - 0.1 = 0.5 $ → $ 0.5 + 0.1 = 0.6 $ → 0.6

12) $ \_\_ - 0.2 = 0.3 $ → $ 0.3 + 0.2 = 0.5 $ → 0.5

13) $ \_\_ - 0.5 = 0.1 $ → $ 0.1 + 0.5 = 0.6 $ → 0.6

14) $ \_\_ - 0.3 = 0.4 $ → $ 0.4 + 0.3 = 0.7 $ → 0.7

15) $ \_\_ - 0.4 = 0.6 $ → $ 0.6 + 0.4 = 1.0 $ → 1.0

16) $ \_\_ - 0.4 = 0.5 $ → $ 0.5 + 0.4 = 0.9 $ → 0.9

17) $ \_\_ - 0.1 = 0.9 $ → $ 0.9 + 0.1 = 1.0 $ → 1.0

18) $ \_\_ - 1 = 0.3 $ → $ 0.3 + 1 = 1.3 $ → 1.3

19) $ \_\_ - 1 = 0.8 $ → $ 0.8 + 1 = 1.8 $ → 1.8

20) $ \_\_ - 0.7 = 0.6 $ → $ 0.6 + 0.7 = 1.3 $ → 1.3

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Column 2 (Problems 21–40)

21) $ 1.4 - \_\_ = 0.8 $ → $ 1.4 - 0.8 = 0.6 $ → 0.6

22) $ 1.7 - \_\_ = 1.1 $ → $ 1.7 - 1.1 = 0.6 $ → 0.6

23) $ \_\_ - 0.3 = 0.9 $ → $ 0.9 + 0.3 = 1.2 $ → 1.2

24) $ \_\_ - 0.6 = 1.1 $ → $ 1.1 + 0.6 = 1.7 $ → 1.7

25) $ 1.5 - \_\_ = 0.3 $ → $ 1.5 - 0.3 = 1.2 $ → 1.2

26) $ 1.9 - \_\_ = 1.4 $ → $ 1.9 - 1.4 = 0.5 $ → 0.5

27) $ \_\_ - 0.8 = 1.1 $ → $ 1.1 + 0.8 = 1.9 $ → 1.9

28) $ \_\_ - 1.2 = 1.3 $ → $ 1.3 + 1.2 = 2.5 $ → 2.5

29) $ \_\_ - 2.1 = 1.4 $ → $ 1.4 + 2.1 = 3.5 $ → 3.5

30) $ 2.6 - \_\_ = 1.1 $ → $ 2.6 - 1.1 = 1.5 $ → 1.5

31) $ 4.8 - \_\_ = 2.5 $ → $ 4.8 - 2.5 = 2.3 $ → 2.3

32) $ \_\_ - 1.5 = 1.6 $ → $ 1.6 + 1.5 = 3.1 $ → 3.1

33) $ \_\_ - 2.1 = 3.2 $ → $ 3.2 + 2.1 = 5.3 $ → 5.3

34) $ \_\_ - 1.7 = 0.5 $ → $ 0.5 + 1.7 = 2.2 $ → 2.2

35) $ 3.1 - \_\_ = 1.9 $ → $ 3.1 - 1.9 = 1.2 $ → 1.2

36) $ 5.6 - \_\_ = 2.2 $ → $ 5.6 - 2.2 = 3.4 $ → 3.4

37) $ 7.4 - \_\_ = 1 $ → $ 7.4 - 1 = 6.4 $ → 6.4

38) $ 6.7 - \_\_ = 5.5 $ → $ 6.7 - 5.5 = 1.2 $ → 1.2

39) $ \_\_ - 2.4 = 3.2 $ → $ 3.2 + 2.4 = 5.6 $ → 5.6

40) $ \_\_ - 3.5 = 5.1 $ → $ 5.1 + 3.5 = 8.6 $ → 8.6

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Column 3 (Problems 41–60)

41) $ 9.6 - \_\_ = 2.5 $ → $ 9.6 - 2.5 = 7.1 $ → 7.1

42) $ \_\_ - 3.2 = 5.7 $ → $ 5.7 + 3.2 = 8.9 $ → 8.9

43) $ \_\_ - 1.8 = 2.5 $ → $ 2.5 + 1.8 = 4.3 $ → 4.3

44) $ 3.4 - \_\_ = 1.7 $ → $ 3.4 - 1.7 = 1.7 $ → 1.7

45) $ 8.1 - \_\_ = 5.6 $ → $ 8.1 - 5.6 = 2.5 $ → 2.5

46) $ \_\_ - 4.7 = 3.6 $ → $ 3.6 + 4.7 = 8.3 $ → 8.3

47) $ \_\_ - 1.8 = 4 $ → $ 4 + 1.8 = 5.8 $ → 5.8

48) $ \_\_ - 2.5 = 4.9 $ → $ 4.9 + 2.5 = 7.4 $ → 7.4

49) $ \_\_ - 3.7 = 5.8 $ → $ 5.8 + 3.7 = 9.5 $ → 9.5

50) $ 8.6 - \_\_ = 2.8 $ → $ 8.6 - 2.8 = 5.8 $ → 5.8

51) $ 9 - \_\_ = 1.7 $ → $ 9 - 1.7 = 7.3 $ → 7.3

52) $ \_\_ - 6.8 = 1.9 $ → $ 1.9 + 6.8 = 8.7 $ → 8.7

53) $ 10 - \_\_ = 5.9 $ → $ 10 - 5.9 = 4.1 $ → 4.1

54) $ \_\_ - 6.8 = 5.6 $ → $ 5.6 + 6.8 = 12.4 $ → 12.4

55) $ \_\_ - 7.6 = 4.2 $ → $ 4.2 + 7.6 = 11.8 $ → 11.8

56) $ 12.5 - \_\_ = 11.9 $ → $ 12.5 - 11.9 = 0.6 $ → 0.6

57) $ \_\_ - 0.7 = 13.6 $ → $ 13.6 + 0.7 = 14.3 $ → 14.3

58) $ \_\_ - 2.5 = 11.6 $ → $ 11.6 + 2.5 = 14.1 $ → 14.1

59) $ 13.6 - \_\_ = 10.9 $ → $ 13.6 - 10.9 = 2.7 $ → 2.7

60) $ \_\_ - 4.8 = 9.6 $ → $ 9.6 + 4.8 = 14.4 $ → 14.4

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✔ Final Answers:

| # | Answer |
|---|--------|
| 1 | 0.3 |
| 2 | 0.2 |
| 3 | 0.5 |
| 4 | 0.6 |
| 5 | 0.7 |
| 6 | 0.5 |
| 7 | 0.2 |
| 8 | 0.5 |
| 9 | 0.5 |
|10 | 0.9 |
|11 | 0.6 |
|12 | 0.5 |
|13 | 0.6 |
|14 | 0.7 |
|15 | 1.0 |
|16 | 0.9 |
|17 | 1.0 |
|18 | 1.3 |
|19 | 1.8 |
|20 | 1.3 |
|21 | 0.6 |
|22 | 0.6 |
|23 | 1.2 |
|24 | 1.7 |
|25 | 1.2 |
|26 | 0.5 |
|27 | 1.9 |
|28 | 2.5 |
|29 | 3.5 |
|30 | 1.5 |
|31 | 2.3 |
|32 | 3.1 |
|33 | 5.3 |
|34 | 2.2 |
|35 | 1.2 |
|36 | 3.4 |
|37 | 6.4 |
|38 | 1.2 |
|39 | 5.6 |
|40 | 8.6 |
|41 | 7.1 |
|42 | 8.9 |
|43 | 4.3 |
|44 | 1.7 |
|45 | 2.5 |
|46 | 8.3 |
|47 | 5.8 |
|48 | 7.4 |
|49 | 9.5 |
|50 | 5.8 |
|51 | 7.3 |
|52 | 8.7 |
|53 | 4.1 |
|54 | 12.4 |
|55 | 11.8 |
|56 | 0.6 |
|57 | 14.3 |
|58 | 14.1 |
|59 | 2.7 |
|60 | 14.4 |

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📝 Explanation Summary:

- Each problem involves subtracting decimals to one decimal place.
- For missing minuends (e.g., $ \_\_ - A = B $), add $ A + B $.
- For missing subtrahends (e.g., $ A - \_\_ = B $), subtract $ A - B $.
- Remember: 10 tenths = 1 whole, so when dealing with values like 0.5 or 1.3, treat them as parts of a whole.

This practice helps build fluency in decimal arithmetic — essential for more advanced math!

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