P5 Mathematics SA1 2021 — Rosyth

Q: Round 345 643 to the nearest thousand.

C. 346 000. To round 345 643 to the nearest thousand, look at the hundreds digit (6). Since 6 ≥ 5, round up: 345 643 → 346 000.

Q: What is the value of 72 000 ÷ 900?

B. 80. 72 000 ÷ 900 = 720 ÷ 9 = 80.

Q: How many sixths are there in 2/3?

D. 4. Convert 2/3 to sixths: 2/3 = 4/6. So there are 4 sixths in 2/3.

Q: In the diagram below, AB is the height of triangle ACD. Which one of the following represents the base of triangle ACD?

A. CD. The base of a triangle must be perpendicular to its height. AB is perpendicular to the line containing B, C, and D. Since the triangle is ACD, the base must be the side CD (which lies along the perpendicular line from the foot of the height).

Q: Ahmad had 12 sweets and Brian had 20 sweets. What is the ratio of the number of sweets Ahmad had to the total number of sweets?

C. 3 : 8. Total sweets = 12 + 20 = 32. Ratio of Ahmad's sweets to total = 12 : 32 = 3 : 8.

P5 Mathematics 2021 SA1 19 questions 36 marks

Source: Rosyth, 2021

This P5 Mathematics SA1 paper from Rosyth (2021) contains 19 questions worth 36 marks. Use it as a study reference for Mathematics topics typically tested at P5 level in Singapore schools.

Q1 MCQ 1 mark

Round 345 643 to the nearest thousand.

Q2 MCQ 1 mark

What is the value of 72 000 ÷ 900?

Q3 MCQ 1 mark

How many sixths are there in 2/3?

Q4 MCQ 1 mark 🖼 Visual

In the diagram below, AB is the height of triangle ACD. Which one of the following represents the base of triangle ACD?

Q5 MCQ 1 mark

Ahmad had 12 sweets and Brian had 20 sweets. What is the ratio of the number of sweets Ahmad had to the total number of sweets?

Q6 Open-ended 1 mark

Find the value of 36 − (20 + 4) × 5 ÷ 4.

Q7 Open-ended 1 mark 🖼 Visual

Find the area of the triangle shown below.

Q8 Open-ended 1 mark

Express 13/20 as a decimal.

Q9 Open-ended 2 marks

May had 7/8 m of ribbon. She used 1/6 m of ribbon to tie a present. How much ribbon had she left? Give your answer in its simplest form.

Q10 Open-ended 2 marks

Candice and Elijah had a total of $450. The ratio of the amount of money that Candice had to the amount of money that Elijah had was 4 : 5. How much money did Elijah have?

Q11 Open-ended 2 marks

Camille and Jane had the same number of marbles at first. When Jane gave Camille 28 marbles, Camille had five times as many marbles as Jane. How many marbles did each of them have at first?

Q12 Open-ended 2 marks

Mary has 20 more stickers than Carl. Hilda has 3 times as many stickers as Mary. They have a total of 145 stickers. How many stickers does Carl have?

Q13 Open-ended 2 marks

Ahmad had 7/10 kg of flour. He used 1/4 of it to bake some cookies. How much flour did he use to bake the cookies?

Q14 Open-ended 2 marks

1/3 of a number is 10. What is 5/8 of the same number?

Q15 Open-ended 2 marks

Britney had 189 stamps. The ratio of the number of stamps that Susan had to the number of stamps that Britney had was 7 : 9. How many stamps did Susan have?

Q16 Open-ended 3 marks

There were some chairs in a hall that were arranged in rows of 15 at first. When 137 chairs were brought into the hall, the chairs were then rearranged in rows of 12. There were now 14 more rows and the last row only had 8 chairs. How many chairs are there in the hall at first?

Q17 Structured 3 marks 🖼 Visual

The figure below is formed by 5 identical triangles. (a) What is the length of AB? (b) What is the area of triangle ABC?

Q18 Open-ended 4 marks

The price of 1 durian was $20. A shopkeeper gave 1 durian free for every 4 durians that were bought. Lisa spent a total of $620 on the durians. How many durians did Lisa get?

Q19 Open-ended 4 marks

Ronan spent 1/7 of his money and an additional $30 on a shirt. He spent 2/3 of the remaining money and an additional $15 on a pair of jeans. If he had $75 left, how much money did Ronan have at first?

P5 Mathematics SA1 2021 — Rosyth

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