Q1
Open-ended
1 mark
🖼 Visual
In triangle ABC, if the base is AB, the height is ____.
P5 Mathematics CA1 2021 — Raffles Girls
Source: Raffles Girls, 2021
This P5 Mathematics CA1 paper from Raffles Girls (2021) contains 13 questions worth 32 marks. Use it as a study reference for Mathematics topics typically tested at P5 level in Singapore schools.
Q2
Open-ended
1 mark
What is the missing number in the box?
16 : 36 = 28 : ☐
Q3
Open-ended
2 marks
🖼 Visual
In triangle PQR, PQ = 13 cm, PR = 15 cm, QS = 4 cm and QR = 6 cm. Find the area of triangle PQR.
Q4
Open-ended
2 marks
In a school, the ratio of the number of Chinese pupils to Indian pupils is 7 : 2. There are 560 more Chinese pupils than Indian pupils. How many Indian pupils are there in the school?
Q5
Open-ended
2 marks
🖼 Visual
Find the area of the shaded part.
Q6
Structured
2 marks
🖼 Visual
Penny made some ice cream following the recipe below.
Recipe for ice cream
Milk — 200 mℓ
Whipping Cream — 500 mℓ
Maple Syrup — 100 mℓ
(a) Find the ratio of the quantity of milk to the quantity of whipping cream to the quantity of maple syrup needed in the recipe. Express the ratio in its simplest form.
(b) Penny used 150 mℓ of maple syrup, how much whipping cream did she use?
Q7
Open-ended
2 marks
🖼 Visual
In the figure, AE = ED. Find the area of the shaded part.
Q8
Open-ended
2 marks
Adam, Bill and Carlos had marbles in the ratio of 3 : 10 : 8. After Adam received a total of 180 marbles from Bill and Carlos, the three boys had the same number of marbles. How many marbles did Bill give to Adam?
Q9
Open-ended
2 marks
Mr Yeo had 84 mangoes and some pineapples at his fruit stall. The ratio of the number of mangoes to the number of pineapples was 4 : 5. He sold 35 mangoes and 35 pineapples. What was the ratio of the number of mangoes to the number of pineapples in the end?
Q10
Open-ended
3 marks
🖼 Visual
A figure is formed with a small heart and a big heart overlapping at the shaded part. The ratio of the area of the small heart to the shaded area of the figure to the unshaded area of the figure is 15 : 7 : 27. The shaded area is 735 cm². Find the area of the big heart.
Q11
Structured
4 marks
🖼 Visual
The perimeter of rectangle PQRS is 38 cm. PY = QX = SY.
(a) Find the length of QR.
(b) Find the area of triangle RXY.
Q12
Open-ended
4 marks
🖼 Visual
The figure is made up of rectangle ABCD and triangle EFG. The area of the unshaded part of the figure is 3/5 of the area of triangle EFG. The total area of the shaded parts is 96 cm². Find the length of BC.
Q13
Structured
5 marks
There were green, red and blue pens in the school bookshop. The number of green pens to the number of red pens was in the ratio of 8 : 5 at first. Then, 1/4 of the green pens and 1/2 of the blue pens were sold, but none of the red pens were sold. The number of blue pens left was twice the sum of red and green pens left. A total of 360 pens were sold.
(a) What was the ratio of the number of green pens left to the number of red pens left in the end?
(b) How many blue pens were there at first?