Free Printable Mental Maths Worksheets for Children aged 4-11 - Free Printable

It looks like you've uploaded a worksheet titled "Double a Decimal under 10 2dp" from Mental-Arithmetic.co.uk, which is designed for children aged 6–11. The task involves doubling decimals that are less than 10 and have two decimal places (2dp).

Let me solve each problem step by step and explain the process.

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🔧 What does "double a decimal" mean?

To double a number means to multiply it by 2.
For example:
- Double of 3.45 = 3.45 × 2 = 6.90

We'll apply this to each row in the worksheet.

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✔ Let's solve all the problems:

#### Row 1:
1. 2.88 + 2.88 = ?
→ 2.88 × 2 = 5.76

2. halve 4.44 = ?
→ Halve means divide by 2: 4.44 ÷ 2 = 2.22

3. double 3.11 = ?
→ 3.11 × 2 = 6.22

#### Row 2:
4. double 1.01 = ?
→ 1.01 × 2 = 2.02

5. halve 4.55 = ?
→ 4.55 ÷ 2 = 2.275 → But since we're working with 2dp, round to 2.28

6. double 8.79 = ?
→ 8.79 × 2 = 17.58

#### Row 3:
7. 4.84 + 4.84 = ?
→ 4.84 × 2 = 9.68

8. 8.64 + 8.64 = ?
→ 8.64 × 2 = 17.28

9. double 4.33 = ?
→ 4.33 × 2 = 8.66

#### Row 4:
10. double 7.37 = ?
→ 7.37 × 2 = 14.74

11. 4.03 + 4.03 = ?
→ 4.03 × 2 = 8.06

12. double 9.79 = ?
→ 9.79 × 2 = 19.58

#### Row 5:
13. double 3.27 = ?
→ 3.27 × 2 = 6.54

14. 1.55 + 1.55 = ?
→ 1.55 × 2 = 3.10

15. 3.43 + 3.43 = ?
→ 3.43 × 2 = 6.86

#### Row 6:
16. double 2.23 = ?
→ 2.23 × 2 = 4.46

17. double 7.34 = ?
→ 7.34 × 2 = 14.68

18. double 3.02 = ?
→ 3.02 × 2 = 6.04

#### Row 7:
19. 4.75 + 4.75 = ?
→ 4.75 × 2 = 9.50

20. 8.73 + 8.73 = ?
→ 8.73 × 2 = 17.46

21. double 2.23 = ?
→ 2.23 × 2 = 4.46

#### Row 8:
22. double 1.77 = ?
→ 1.77 × 2 = 3.54

23. double 8.07 = ?
→ 8.07 × 2 = 16.14

24. 0.27 + 0.27 = ?
→ 0.27 × 2 = 0.54

#### Row 9:
25. 8.47 + 8.47 = ?
→ 8.47 × 2 = 16.94

26. double 4.25 = ?
→ 4.25 × 2 = 8.50

27. 5.02 + 5.02 = ?
→ 5.02 × 2 = 10.04

#### Row 10:
28. double 0.51 = ?
→ 0.51 × 2 = 1.02

29. double 8.88 = ?
→ 8.88 × 2 = 17.76

30. 1.54 + 1.54 = ?
→ 1.54 × 2 = 3.08

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✔ Final Answers (in order):

| Problem | Answer |
|--------|--------|
| 1. 2.88 + 2.88 | 5.76 |
| 2. halve 4.44 | 2.22 |
| 3. double 3.11 | 6.22 |
| 4. double 1.01 | 2.02 |
| 5. halve 4.55 | 2.28 |
| 6. double 8.79 | 17.58 |
| 7. 4.84 + 4.84 | 9.68 |
| 8. 8.64 + 8.64 | 17.28 |
| 9. double 4.33 | 8.66 |
| 10. double 7.37 | 14.74 |
| 11. 4.03 + 4.03 | 8.06 |
| 12. double 9.79 | 19.58 |
| 13. double 3.27 | 6.54 |
| 14. 1.55 + 1.55 | 3.10 |
| 15. 3.43 + 3.43 | 6.86 |
| 16. double 2.23 | 4.46 |
| 17. double 7.34 | 14.68 |
| 18. double 3.02 | 6.04 |
| 19. 4.75 + 4.75 | 9.50 |
| 20. 8.73 + 8.73 | 17.46 |
| 21. double 2.23 | 4.46 |
| 22. double 1.77 | 3.54 |
| 23. double 8.07 | 16.14 |
| 24. 0.27 + 0.27 | 0.54 |
| 25. 8.47 + 8.47 | 16.94 |
| 26. double 4.25 | 8.50 |
| 27. 5.02 + 5.02 | 10.04 |
| 28. double 0.51 | 1.02 |
| 29. double 8.88 | 17.76 |
| 30. 1.54 + 1.54 | 3.08 |

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📝 Notes:

- Doubling: Multiply by 2.
- Halving: Divide by 2.
- When rounding (like 4.55 ÷ 2 = 2.275), we round to 2 decimal places, so 2.275 → 2.28.

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💡 Tips for Students:

- Line up the decimal points when adding.
- Remember: doubling is just multiplying by 2 — you can do it mentally or use column addition.
- For halving, think: "What number times 2 gives me this?"

Let me know if you'd like a printable version or a PDF of the completed worksheet!