香港小四數學練習卷（下學期・第二份）四則運算、分數、面積與棒形圖｜16 題、45 分鐘

練習卷 · 小學數學

香港小四數學下學期第二份練習卷：兩位數乘除、因數倍數與 HCF、等值分數、小數加減、正方形長方形周界面積，加一個借書棒形圖，共 16 題、45 分鐘、100 分；試題全英文，每題附答案與評分要點，題目版及答案版 PDF 可即時列印操卷。

卷面資料　年級：小四　｜　科目：數學　｜　時限：45 分鐘　｜　總分：100 分　｜　題數：16

甲部　短答題（8 題，每題 3 分）

計算下列各題。

#	題目	答案與評分要點
1	Work out 46 × 27.	46 × 27 = 1242
2	Work out 936 ÷ 8.	936 ÷ 8 = 117
3	Find the HCF and the LCM of 36 and 48.	HCF = 12, LCM = 144 (list the factors / multiples or use prime factorisation).
4	Simplify 18/24. Give the answer in its simplest form.	18/24 = 3/4 (divide both the numerator and the denominator by 6).
5	Work out 7.6 + 3.85.	7.6 + 3.85 = 11.45 (align the decimal points).
6	Work out 12.4 − 5.75.	12.4 − 5.75 = 6.65 (borrow from the ones).
7	A rectangle is 18 cm long and 9 cm wide. Find its perimeter.	(18 + 9) × 2 = 54 cm
8	A square has sides of 12 cm. Find its area.	12 × 12 = 144 cm²

列出算式，並寫出答案及單位。

#	題目	答案與評分要點
9	A shop packs 1248 pens equally into boxes of 24 pens each. How many boxes are needed?	1248 ÷ 24 = 52 boxes. (1 mark for the correct operation, 1 for the working, 1 for the answer.)
10	May read 2/5 of a book on Monday and 1/5 of the book on Tuesday. What fraction of the book is still unread?	Read: 2/5 + 1/5 = 3/5. Unread: 1 − 3/5 = 2/5 of the book. (2 marks each step, 1 for the unit “of the book”.)
11	Bus A leaves the terminus every 12 minutes and Bus B every 18 minutes. Both leave together at 09:00. When will they next leave together?	LCM of 12 and 18 = 36 minutes. 09:00 + 36 minutes = 09:36.
12	Ken buys 3 books at $42.50 each and pays with a $200 note. How much change does he get?	Cost: $42.50 × 3 = $127.50. Change: $200 − $127.50 = $72.50.
13	A playground is 25 m long and 16 m wide. Find (a) its perimeter and (b) its area.	(a) (25 + 16) × 2 = 82 m. (b) 25 × 16 = 400 m². Units must be correct: m for perimeter, m² for area.

圖一：四班一星期到圖書館借書的數量（本，示例數據）

根據圖表及題意作答，須列出算式。

#	題目	答案與評分要點
14	The bar chart shows the number of library books borrowed by four classes in one week. (a) How many books were borrowed altogether? (b) How many more books did 4D borrow than 4C? (c) Find the mean number of books borrowed per class.	(a) 40 + 55 + 35 + 60 = 190 books. (b) 60 − 35 = 25 books. (c) 190 ÷ 4 = 47.5 books per class.
15	A tank holds 4.5 L of water. Water is poured into bottles of 0.75 L each until the tank is empty. (a) How many bottles are filled? (b) Two bottles are spilt afterwards. How many millilitres of water are left?	(a) 4.5 ÷ 0.75 = 6 bottles. (b) Spilt: 2 × 0.75 = 1.5 L; left: 4.5 − 1.5 = 3 L = 3000 ml. (1 mark for the unit conversion.)
16	A rectangular floor is 96 cm by 72 cm. It is covered completely by square tiles of the same size, using the largest possible tiles. (a) What is the side length of each tile? (b) How many tiles are used? (c) If each tile costs $18, what is the total cost?	(a) HCF of 96 and 72 = 24 cm. (b) (96 ÷ 24) × (72 ÷ 24) = 4 × 3 = 12 tiles. (c) 12 × $18 = $216.

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