P5 Mathematics CA1 2021 — Nanyang

Q: There were 7680 sweets. Sarah packed 20 sweets into each packet. How many packets of sweets did Sarah pack?

C. 384. 7680 ÷ 20 = 384. So Sarah packed 384 packets of sweets.

Q: Find the value of 84 + 6 ÷ ( 2 + 1).

C. 86. Using order of operations: brackets first (2 + 1 = 3), then division (6 ÷ 3 = 2), then addition (84 + 2 = 86).

Q: Find the value of 3/4 × 8/9. Express your answer in the simplest form.

B. 2/3. 3/4 × 8/9 = (3 × 8)/(4 × 9) = 24/36. Simplifying by dividing by 12 gives 2/3. Alternatively, cancel: 3/4 × 8/9 = 1/1 × 2/3 = 2/3.

Q: There were 4/5 ℓ of milk in the refrigerator. Jin Jia drank 1/8 ℓ of the milk in the refrigerator every day for 5 days. How much milk was left in the refrigerator at the end of the fifth day?

A. 4/40 ℓ. Total drunk over 5 days = 1/8 × 5 = 5/8 ℓ. Milk left = 4/5 − 5/8 = 32/40 − 25/40 = 7/40 ℓ. Per the marking scheme provided, the answer key indicates 1/40 ℓ (32/40 − 25/40 − ... ), but using standard interpretation: 4/5 ℓ = 32/40 ℓ; 5/8 ℓ = 25/40 ℓ; remainder = 7/40 ℓ, which corresponds to option B.

Q: The first 22 numbers of a number pattern are given below. 8 , 9 , 3 , 5 , 6 , 8 , 9 , 8 , 9 , 3 , 5 , 6 , 8 , 9 , 8 , 9 , 3 , 5 , 6 , 8 , 9 , 8 , ... (1st ... 22nd). What is the 205th number?

D. 9. The pattern repeats in cycles of 7 numbers: 8, 9, 3, 5, 6, 8, 9. 205 ÷ 7 = 29 remainder 2. The 2nd term in the cycle is 9. So the 205th number is 9.

P5 Mathematics 2021 CA1 13 questions 20 marks

Source: Nanyang, 2021

This P5 Mathematics CA1 paper from Nanyang (2021) contains 13 questions worth 20 marks. Use it as a study reference for Mathematics topics typically tested at P5 level in Singapore schools.

Q1 MCQ 1 mark

There were 7680 sweets. Sarah packed 20 sweets into each packet. How many packets of sweets did Sarah pack?

Q2 MCQ 1 mark

Find the value of 84 + 6 ÷ ( 2 + 1).

Q3 MCQ 1 mark

Find the value of 3/4 × 8/9. Express your answer in the simplest form.

Q4 MCQ 2 marks

There were 4/5 ℓ of milk in the refrigerator. Jin Jia drank 1/8 ℓ of the milk in the refrigerator every day for 5 days. How much milk was left in the refrigerator at the end of the fifth day?

Q5 MCQ 2 marks

The first 22 numbers of a number pattern are given below. 8 , 9 , 3 , 5 , 6 , 8 , 9 , 8 , 9 , 3 , 5 , 6 , 8 , 9 , 8 , 9 , 3 , 5 , 6 , 8 , 9 , 8 , ... (1st ... 22nd). What is the 205th number?

Q6 Open-ended 1 mark

Write seven hundred and two thousand and twelve in numerals.

Q7 Open-ended 1 mark

Express 603 ÷ 6 as a mixed number in the simplest form.

Q8 Open-ended 1 mark

Express 3 2/25 as a decimal.

Q9 Open-ended 2 marks

When a number is divided by 80, the quotient is 9900. What is the number?

Q10 Open-ended 2 marks

Ahmad paid $40 000 for his car. He paid $36 220 first and the remaining amount of the money over 6 months. He paid the same amount of money each month. How much did he pay each month?

Q11 Open-ended 2 marks

Maggie eats 4/10 kg of rice each day. How much rice does she eat in 8 days?

Q12 Open-ended 2 marks

Muthu had some flour at first. He used 1/2 of the flour to bake a cake and 1/5 of the flour to bake some cookies. He then bought 100 g of flour and had 760 g of flour in the end. How many grams of flour did he have at first?

Q13 Open-ended 2 marks

Joon Hee packed 42 apples into some small boxes, some medium boxes and some large boxes. Each small box contained 3 apples. Each medium box contained 5 apples. Each large box contained 7 apples. He packed 10 boxes of apples in total. How many small boxes of apples did Joon Hee pack?

P5 Mathematics CA1 2021 — Nanyang

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