香港小四数学练习卷（下学期・第二份）四则运算、分数、面积与棒形图｜16 题、45 分钟

练习卷 · 小学数学

香港小四数学下学期第二份练习卷：两位数乘除、因数倍数与 HCF、等值分数、小数加减、正方形长方形周界面积，加一个借书棒形图，共 16 题、45 分钟、100 分；试题全英文，每题附答案与评分要点，题目版及答案版 PDF 可即时打印操卷。

卷面资料　年级：小四　｜　科目：数学　｜　时限：45 分钟　｜　总分：100 分　｜　题数：16

甲部　短答题（8 题，每题 3 分）

计算下列各题。

#	题目	答案与评分要点
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，并写出答案及单位。

#	题目	答案与评分要点
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.

图一：四班一星期到图书馆借书的数量（本，示例数据）

根据图表及题意作答，须列出算式。

#	题目	答案与评分要点
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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