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) covers patterns and algebra, fractions, measurement, decimals and money across 13 questions worth 20 marks. Practise Mathematics the way it's tested at P5 level in Singapore, with step-by-step answers on LearnBuddy.

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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?

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P5 Mathematics CA1 2021 — Nanyang

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