Decimal Place Value Worksheets 4th Grade - Free Printable

Let's solve each problem step by step using place value knowledge, especially focusing on tenths (the first digit after the decimal point). We'll add numbers carefully, aligning whole numbers and decimals properly.

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Problems 1–20: Addition Problems

We’ll compute each sum:

1) $4 + 0.3 = 4.3$
2) $7 + 0.8 = 7.8$
3) $1 + 0.2 = 1.2$
4) $10 + 5 + 0.3 = 15.3$
5) $70 + 4 + 0.5 = 74.5$
6) $80 + 0.9 = 80.9$
7) $40 + 5 + 0.3 = 45.3$
8) $10 + 0.6 + 4 = 14.6$
9) $30 + 0.2 + 7 = 37.2$
10) $100 + 0.8 + 5 = 105.8$
11) $0.4 + 7 + 50 = 57.4$
12) $0.9 + 20 + 6 = 26.9$
13) $50 + 0.5 + 9 = 59.5$
14) $100 + 0.2 + 26 = 126.2$
15) $71 + 200 + 0.8 = 271.8$
16) $50 + 7.8 = 57.8$
17) $70 + 2.5 = 72.5$
18) $30.6 + 7 = 37.6$
19) $40.2 + 3 = 43.2$
20) $107 + 80.6 = 187.6$

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Problems 21–40: Fill in the Blank

We need to find the missing number. Use subtraction:
Missing number = Total – Sum of known numbers

21) $10 + \_\_ + 4 = 14.6$
→ $10 + 4 = 14$, so $14.6 - 14 = 0.6$ → 0.6

22) $70 + 8 + \_\_ = 78.7$
→ $70 + 8 = 78$, so $78.7 - 78 = 0.7$ → 0.7

23) $100 + 52 + \_\_ = 152.2$
→ $100 + 52 = 152$, so $152.2 - 152 = 0.2$ → 0.2

24) $0.3 + \_\_ + 200 = 240.3$
→ $0.3 + 200 = 200.3$, so $240.3 - 200.3 = 40$ → 40

25) $0.6 + 90 + \_\_ = 96.6$
→ $0.6 + 90 = 90.6$, so $96.6 - 90.6 = 6$ → 6

26) $52 + \_\_ + 100 = 152.7$
→ $52 + 100 = 152$, so $152.7 - 152 = 0.7$ → 0.7

27) $30 + 0.8 + \_\_ = 230.8$
→ $30 + 0.8 = 30.8$, so $230.8 - 30.8 = 200$ → 200

28) $70.5 + 100 + \_\_ = 172.5$
→ $70.5 + 100 = 170.5$, so $172.5 - 170.5 = 2$ → 2

29) $200 + 50.6 + \_\_ = 259.6$
→ $200 + 50.6 = 250.6$, so $259.6 - 250.6 = 9$ → 9

30) $\_\_ + 6.7 + 100 = 176.7$
→ $6.7 + 100 = 106.7$, so $176.7 - 106.7 = 70$ → 70

31) $8.3 + \_\_ + 40 = 848.3$
→ $8.3 + 40 = 48.3$, so $848.3 - 48.3 = 800$ → 800

32) $80 + 300 + \_\_ = 382.4$
→ $80 + 300 = 380$, so $382.4 - 380 = 2.4$ → 2.4

33) $600 + 90 + \_\_ = 698.6$
→ $600 + 90 = 690$, so $698.6 - 690 = 8.6$ → 8.6

34) $720 + \_\_ = 727.9$
→ $727.9 - 720 = 7.9$ → 7.9

35) $\_\_ + 130 = 135.7$
→ $135.7 - 130 = 5.7$ → 5.7

36) $200 + \_\_ = 247.6$
→ $247.6 - 200 = 47.6$ → 47.6

37) $700 + \_\_ = 781.3$
→ $781.3 - 700 = 81.3$ → 81.3

38) $\_\_ + 8 = 68.2$
→ $68.2 - 8 = 60.2$ → 60.2

39) $9 + \_\_ = 129.5$
→ $129.5 - 9 = 120.5$ → 120.5

40) $200.6 + \_\_ = 257.6$
→ $257.6 - 200.6 = 57$ → 57

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✔ Final Answers:

#### 1–20:
1) 4.3
2) 7.8
3) 1.2
4) 15.3
5) 74.5
6) 80.9
7) 45.3
8) 14.6
9) 37.2
10) 105.8
11) 57.4
12) 26.9
13) 59.5
14) 126.2
15) 271.8
16) 57.8
17) 72.5
18) 37.6
19) 43.2
20) 187.6

#### 21–40:
21) 0.6
22) 0.7
23) 0.2
24) 40
25) 6
26) 0.7
27) 200
28) 2
29) 9
30) 70
31) 800
32) 2.4
33) 8.6
34) 7.9
35) 5.7
36) 47.6
37) 81.3
38) 60.2
39) 120.5
40) 57

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🔍 Explanation:

- For addition problems, we added whole numbers and decimals separately.
- For fill-in-the-blank, we subtracted the known values from the total.
- Remember: Tenths are the first decimal place (e.g., 0.3 is three tenths).
- Always line up decimals when adding or subtracting.

Let me know if you'd like this formatted as a printable answer key!