Let's solve the
Mental Maths section of this Grade 4 Mathematics Baseline Assessment step by step.
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Section A: Mental Maths (20 marks)
We'll go through each question one by one and provide the correct answer with a brief explanation.
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1. 304 - 10 = ________
- Subtracting 10 from 304:
$ 304 - 10 = 294 $
✔ Answer: 294
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2. 345 - 25 = ________
- Break it down:
$ 345 - 20 = 325 $, then $ 325 - 5 = 320 $
✔ Answer: 320
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3. 462 - 10 = ________
- Simple subtraction:
$ 462 - 10 = 452 $
✔ Answer: 452
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4. 25 - 8 = ________
- Count backwards from 25:
$ 25 - 8 = 17 $
✔ Answer: 17
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5. 264 + 20 = ________
- Add 20 to 264:
$ 264 + 20 = 284 $
✔ Answer: 284
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6. 12 + 9 = ________
- $ 12 + 9 = 21 $
✔ Answer: 21
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7. 9 + 8 = ________
- $ 9 + 8 = 17 $
✔ Answer: 17
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8. 497 + 20 = ________
- $ 497 + 20 = 517 $
✔ Answer: 517
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9. 18 - 9 = ________
- $ 18 - 9 = 9 $
✔ Answer: 9
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10. 15 + 0 = ________
- Adding zero doesn't change the number:
$ 15 + 0 = 15 $
✔ Answer: 15
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11. 6 × 1 = ________
- Any number multiplied by 1 is itself:
$ 6 × 1 = 6 $
✔ Answer: 6
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12. (8 × 3) + 50 = ________
- First do multiplication:
$ 8 × 3 = 24 $
Then add:
$ 24 + 50 = 74 $
✔ Answer: 74
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13. 5 × 0 = ________
- Any number multiplied by 0 is 0:
$ 5 × 0 = 0 $
✔ Answer: 0
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14. 6 × 2 = ________
- $ 6 × 2 = 12 $
✔ Answer: 12
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✔ Final Answers:
| Question | Answer |
|--------|--------|
| 1. 304 - 10 |
294 |
| 2. 345 - 25 |
320 |
| 3. 462 - 10 |
452 |
| 4. 25 - 8 |
17 |
| 5. 264 + 20 |
284 |
| 6. 12 + 9 |
21 |
| 7. 9 + 8 |
17 |
| 8. 497 + 20 |
517 |
| 9. 18 - 9 |
9 |
| 10. 15 + 0 |
15 |
| 11. 6 × 1 |
6 |
| 12. (8 × 3) + 50 |
74 |
| 13. 5 × 0 |
0 |
| 14. 6 × 2 |
12 |
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🔍 Summary:
This section tests basic arithmetic skills: addition, subtraction, multiplication, and understanding of properties like multiplying by 0 or 1.
All answers are straightforward and can be done mentally as expected for Grade 4 students.
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✔ Total for Section A: 20/20 (if all are correct)
> ⚠️ Note: This is only
Section A. If there are more sections (B, C, etc.), they would need to be solved separately.
Let me know if you'd like help with the rest of the paper!
Parent Tip: Review the logic above to help your child master the concept of math test 4.
