Fun Year 4 mental maths worksheet focusing on multiplication and division skills for students aged 8-9.

Let's solve each of the multiplication and division problems on this "Ninja Maths" worksheet step by step. These are mental math exercises for Year 4 students (ages 8–9), focusing on multiplication and division facts.

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Solutions:

#### Left Column (Problems 25 to 36):

25) $ 9 \times 11 = 99 $
> Multiply: $ 9 \times 10 = 90 $, then add $ 9 \times 1 = 9 $ → $ 90 + 9 = 99 $

26) $ \_\_ \times 3 = 24 $ → $ 24 \div 3 = 8 $
> So, $ 8 \times 3 = 24 $

27) $ 4 \times \_\_ = 40 $ → $ 40 \div 4 = 10 $
> So, $ 4 \times 10 = 40 $

28) $ 6 \times 9 = 54 $
> $ 6 \times 10 = 60 $, subtract $ 6 $ → $ 60 - 6 = 54 $

29) $ \_\_ \times 7 = 21 $ → $ 21 \div 7 = 3 $
> So, $ 3 \times 7 = 21 $

30) $ 8 \times \_\_ = 24 $ → $ 24 \div 8 = 3 $
> So, $ 8 \times 3 = 24 $

31) $ 5 \times 5 = 25 $

32) $ \_\_ \times 10 = 60 $ → $ 60 \div 10 = 6 $
> So, $ 6 \times 10 = 60 $

33) $ 6 \times \_\_ = 60 $ → $ 60 \div 6 = 10 $
> So, $ 6 \times 10 = 60 $

34) $ 5 \times 7 = 35 $

35) $ \_\_ \times 5 = 35 $ → $ 35 \div 5 = 7 $
> So, $ 7 \times 5 = 35 $

36) $ 5 \times \_\_ = 30 $ → $ 30 \div 5 = 6 $
> So, $ 5 \times 6 = 30 $

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#### Right Column (Problems 37 to 48):

37) $ 9 \times 10 = 90 $

38) $ \_\_ \times 4 = 20 $ → $ 20 \div 4 = 5 $
> So, $ 5 \times 4 = 20 $

39) $ 7 \times \_\_ = 21 $ → $ 21 \div 7 = 3 $
> So, $ 7 \times 3 = 21 $

40) $ 10 \times 9 = 90 $

41) $ \_\_ \times 12 = 36 $ → $ 36 \div 12 = 3 $
> So, $ 3 \times 12 = 36 $

42) $ 5 \times \_\_ = 55 $ → $ 55 \div 5 = 11 $
> So, $ 5 \times 11 = 55 $

43) $ 5 \times 4 = 20 $

44) $ \_\_ \times 11 = 99 $ → $ 99 \div 11 = 9 $
> So, $ 9 \times 11 = 99 $

45) $ 8 \times \_\_ = 56 $ → $ 56 \div 8 = 7 $
> So, $ 8 \times 7 = 56 $

46) $ 12 \times 10 = 120 $

47) $ \_\_ \times 11 = 121 $ → $ 121 \div 11 = 11 $
> So, $ 11 \times 11 = 121 $

48) $ 6 \times \_\_ = 42 $ → $ 42 \div 6 = 7 $
> So, $ 6 \times 7 = 42 $

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✔ Final Answers:

| Problem | Answer |
|--------|--------|
| 25) | 99 |
| 26) | 8 |
| 27) | 10 |
| 28) | 54 |
| 29) | 3 |
| 30) | 3 |
| 31) | 25 |
| 32) | 6 |
| 33) | 10 |
| 34) | 35 |
| 35) | 7 |
| 36) | 6 |
| 37) | 90 |
| 38) | 5 |
| 39) | 3 |
| 40) | 90 |
| 41) | 3 |
| 42) | 11 |
| 43) | 20 |
| 44) | 9 |
| 45) | 7 |
| 46) | 120 |
| 47) | 11 |
| 48) | 7 |

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🔍 Explanation:

- These problems reinforce multiplication facts up to $ 12 \times 12 $.
- For missing factor questions (e.g., $ \_\_ \times 3 = 24 $), we use division to find the unknown number.
- The goal is to build mental math fluency, so students should practice recalling facts quickly.
- Some tricks:
- Multiplying by 10: just add a zero.
- Multiplying by 11: for single digits, $ n \times 11 = nn $ (e.g., $ 9 \times 11 = 99 $).
- Use known facts to derive others (e.g., $ 6 \times 9 = (6 \times 10) - 6 = 60 - 6 = 54 $).

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Let me know if you'd like this as a printable answer sheet or want explanations tailored for a child! 🥷📚