C. 7/10. Convert 2/5 to tenths: 2/5 = 4/10. Then 3/10 + 4/10 = 7/10.

P4 Mathematics CA1 2021 — Tao Nan

Q: 20 km 50 m = _______ m

C. 20 050. 1 km = 1000 m, so 20 km = 20 000 m. Adding the 50 m gives 20 000 + 50 = 20 050 m.

Q: The figure is made up of 6 identical squares. What is the area of the figure?

C. 216 cm². The figure has 3 squares stacked vertically on the right side, giving a total height of 18 cm. So each square is 18 ÷ 3 = 6 cm. Area of one square = 6 × 6 = 36 cm². Total area = 6 × 36 = 216 cm².

Q: Marie boarded a bus at 7.05 a.m. After alighting at the bus-stop, she walked for 10 minutes and reached the market at 7.40 a.m. How long was her bus ride?

B. 25 minutes. Total time from 7.05 a.m. to 7.40 a.m. is 35 minutes. Subtract the 10-minute walk: 35 − 10 = 25 minutes for the bus ride.

Q: A rectangle is divided into 12 equal parts. How many more parts must be shaded so that half of the figure is shaded?

A. 5. Half of 12 parts is 6 parts. Currently 1 part is shaded, so 6 − 1 = 5 more parts must be shaded.

Q: 349 630 is _______ when rounded to the nearest 1000.

B. 350 000. Look at the hundreds digit (6). Since 6 ≥ 5, round the thousands digit up: 349 630 → 350 000.

Q: 1/2 of a number is 16. What is 3/4 of the number?

B. 24. If 1/2 of the number is 16, the number is 32. Then 3/4 of 32 = 24.

Q: Jessie spent 1/6 of her money on a file. She also bought a book for $12. She then had $18 left. How much was the file?

C. 6. After spending 1/6 on the file, she has 5/6 left. From that, she spent $12 on a book and had $18 left, so 5/6 of her money = $12 + $18 = $30. Total money = $30 × 6/5 = $36. The file cost 1/6 × $36 = $6.

Q: How many right angles are there in the figure?

D. 4. The figure is a kite ABCD with diagonals AC and BD meeting at E. The diagonals of a kite are perpendicular, so at point E there are 4 right angles formed.

Q: Meiling is standing at point A and facing East. After turning 135° anti-clockwise direction, she makes a 1/2 turn in a clockwise direction. What direction does she end up facing?

D. South-East. Starting facing East, a 135° anti-clockwise turn brings her to face North-West. A 1/2 turn (180°) clockwise from North-West brings her to face South-East.

P4 Mathematics 2021 CA1 29 questions 58 marks

Source: Tao Nan, 2021

This P4 Mathematics CA1 paper from Tao Nan (2021) contains 29 questions worth 58 marks. Use it as a study reference for Mathematics topics typically tested at P4 level in Singapore schools.

Q1 MCQ 2 marks

20 km 50 m = _______ m

Q2 MCQ 2 marks 🖼 Visual

The figure is made up of 6 identical squares. What is the area of the figure?

Q3 MCQ 2 marks

Marie boarded a bus at 7.05 a.m. After alighting at the bus-stop, she walked for 10 minutes and reached the market at 7.40 a.m. How long was her bus ride?

Q4 MCQ 2 marks

3/10 + 2/5 = _______

Q5 MCQ 2 marks 🖼 Visual

A rectangle is divided into 12 equal parts. How many more parts must be shaded so that half of the figure is shaded?

Q6 MCQ 2 marks

349 630 is _______ when rounded to the nearest 1000.

Q7 MCQ 2 marks

1/2 of a number is 16. What is 3/4 of the number?

Q8 MCQ 2 marks

Jessie spent 1/6 of her money on a file. She also bought a book for $12. She then had $18 left. How much was the file?

Q9 MCQ 2 marks 🖼 Visual

How many right angles are there in the figure?

Q10 MCQ 2 marks 🖼 Visual

Meiling is standing at point A and facing East. After turning 135° anti-clockwise direction, she makes a 1/2 turn in a clockwise direction. What direction does she end up facing?

Q11 Open-ended 2 marks

Write 45 390 in words.

Q12 Open-ended 2 marks

Complete the following number pattern. 63 862, 62 862, 61 862, 60 862, _______

Q13 Structured 2 marks

Find the quotient and remainder. 6 ) 6 8 4 2

Q14 Open-ended 2 marks 🖼 Visual

Use the digits below to form the smallest 4-digit odd number. Each digit can be used only once. Digits: 7, 3, 8, 4

Q15 Open-ended 2 marks

What are the first 2 common multiples of 4 and 6?

Q16 Open-ended 2 marks 🖼 Visual

1/5 of 15 is _______.

Q17 Open-ended 2 marks

Arrange the following fractions in decreasing order. 1/8, 3/4, 1/2

Q18 Open-ended 2 marks

Find the product of 95 and 30.

Q19 Open-ended 2 marks 🖼 Visual

The table below shows a movie schedule at a cinema. Samuel arrives at the cinema at 3.10 p.m. His father will pick him up at 6.00 p.m. Which movie could Samuel watch from the start to the end?

Q20 Structured 2 marks

Kaiming jogs for 20 minutes at the park every evening. What is the total time he spends jogging per week?

Q21 Open-ended 2 marks 🖼 Visual

Draw the given angle using a protractor in the space below. ∠PQR = 125°

Q22 Structured 2 marks

Jun Bin has sixteen coins that add up to $5. There are 50-cent coins and 20-cent coins. How many 50-cent coins does he have?

Q23 Open-ended 2 marks 🖼 Visual

Line GH is parallel to Line _______.

Q24 Structured 2 marks 🖼 Visual

In the figure below, ABCE is a rectangle. Find ∠CBD.

Q25 Structured 2 marks 🖼 Visual

The figure is made up of a rectangle and a square. What is the length of the rectangle?

Q26 Structured 2 marks 🖼 Visual

The figure below shows a big square and a small square. Find the area of the small square.

Q28 Structured 2 marks

The perimeter of a rectangle garden is 100 m. Its length is 35 m. Find the breadth of the rectangular garden.

Q29 Open-ended 2 marks 🖼 Visual

Use the bar graph below to answer questions 29 and 30. The bar graph shows the number of toys sold in 5 months. How many more toys were sold in December than in October?

Q30 Open-ended 2 marks 🖼 Visual

In which month were the number of toys sold half of the number sold in September?

P4 Mathematics CA1 2021 — Tao Nan

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