Decimal Operations Ten Minute Challenge Worksheet | PDF Printable ... - Free Printable

Let's solve each of the Decimal Operations Ten Minute Challenge problems step by step. I'll provide the answers and a brief explanation for each.

---

Left Column (1–15)

1) 0.4 + 1.82 =
Align decimals:
```
0.40
+ 1.82
------
2.22
```
✔ Answer: 2.22

2) 9.0 - 6.99 =
Write as 9.00 - 6.99:
```
9.00
- 6.99
------
2.01
```
✔ Answer: 2.01

3) 4 × 0.2 =
Multiply: 4 × 0.2 = 0.8
✔ Answer: 0.8

4) 48 ÷ 0.8 =
Convert to easier division:
Multiply numerator and denominator by 10:
480 ÷ 8 = 60
✔ Answer: 60

5) 3.5 + 6.7 =
Add:
```
3.5
+ 6.7
----
10.2
```
✔ Answer: 10.2

6) 19.1 - 5.3 =
Subtract:
```
19.1
- 5.3
-----
13.8
```
✔ Answer: 13.8

7) 8.4 ÷ 0.7 =
Multiply both by 10: 84 ÷ 7 = 12
✔ Answer: 12

8) 1.1 × 5 =
1.1 × 5 = 5.5
✔ Answer: 5.5

9) 12.3 + 15.9 =
Add:
```
12.3
+15.9
-----
28.2
```
✔ Answer: 28.2

10) 20.05 - 6.6 =
Write 6.6 as 6.60:
```
20.05
- 6.60
-------
13.45
```
✔ Answer: 13.45

11) 9 × 0.05 =
9 × 0.05 = 0.45
✔ Answer: 0.45

12) 3.2 ÷ 4 =
Divide: 3.2 ÷ 4 = 0.8
✔ Answer: 0.8

13) 0.02 - 0.003 =
Write as 0.020 - 0.003 = 0.017
✔ Answer: 0.017

14) 17.9 + 19.16 =
Align decimals:
```
17.90
+19.16
-------
37.06
```
✔ Answer: 37.06

15) 0.5 × 0.8 =
Multiply: 0.5 × 0.8 = 0.4
✔ Answer: 0.4

---

Right Column (16–30)

16) 7.2 + 10.09 =
Write 7.2 as 7.20:
```
7.20
+10.09
-------
17.29
```
✔ Answer: 17.29

17) 100 - 25.46 =
Write 100 as 100.00:
```
100.00
-25.46
-------
74.54
```
✔ Answer: 74.54

18) 0.6 × 0.3 =
Multiply: 0.6 × 0.3 = 0.18
✔ Answer: 0.18

19) 5.4 ÷ 9 =
5.4 ÷ 9 = 0.6
✔ Answer: 0.6

20) 2.64 + 7.8 =
Write 7.8 as 7.80:
```
2.64
+ 7.80
-------
10.44
```
✔ Answer: 10.44

21) 65.8 - 20.06 =
Write 65.8 as 65.80:
```
65.80
-20.06
-------
45.74
```
✔ Answer: 45.74

22) 0.56 ÷ 8 =
0.56 ÷ 8 = 0.07
✔ Answer: 0.07

23) 2.5 × 7 =
2.5 × 7 = 17.5
✔ Answer: 17.5

24) 88.44 + 10.88 =
Add:
```
88.44
+10.88
-------
99.32
```
✔ Answer: 99.32

25) 0.15 × 4 =
0.15 × 4 = 0.6
✔ Answer: 0.6

26) 0.13 × 0.02 =
Multiply: 13 × 2 = 26 → Count decimal places: 4 total → 0.0026
✔ Answer: 0.0026

27) 10.8 ÷ 0.9 =
Multiply numerator and denominator by 10:
108 ÷ 9 = 12
✔ Answer: 12

28) 12.05 - 3.007 =
Write 12.05 as 12.050:
```
12.050
- 3.007
-------
9.043
```
✔ Answer: 9.043

29) 0.18 ÷ 0.3 =
Multiply numerator and denominator by 10:
1.8 ÷ 3 = 0.6
✔ Answer: 0.6

30) 0.7² =
Square: 0.7 × 0.7 = 0.49
✔ Answer: 0.49

---

✔ Final Answers:

| # | Answer |
|---|--------|
| 1 | 2.22 |
| 2 | 2.01 |
| 3 | 0.8 |
| 4 | 60 |
| 5 | 10.2 |
| 6 | 13.8 |
| 7 | 12 |
| 8 | 5.5 |
| 9 | 28.2 |
|10 | 13.45 |
|11 | 0.45 |
|12 | 0.8 |
|13 | 0.017 |
|14 | 37.06 |
|15 | 0.4 |
|16 | 17.29 |
|17 | 74.54 |
|18 | 0.18 |
|19 | 0.6 |
|20 | 10.44 |
|21 | 45.74 |
|22 | 0.07 |
|23 | 17.5 |
|24 | 99.32 |
|25 | 0.6 |
|26 | 0.0026 |
|27 | 12 |
|28 | 9.043 |
|29 | 0.6 |
|30 | 0.49 |

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✔ All problems solved!
This worksheet covers addition, subtraction, multiplication, and division with decimals, including some tricky ones like small decimals and multiple decimal places. Practice helps build speed and accuracy — great for GCSE Foundation level!

Let me know if you'd like a printable version or explanations in video format!