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Primary 4 Mathematics · Chapter 4 · Answers and explanations

Lesson 4.1: Bar Graphs: Reading and Comparing (answers)

Section A · Multiple choice 4 marks

1. How many books were borrowed on Wednesday?1 mark

Books Borrowed from the Library0102030405060MonTueWedThuFriNumber of books
(A) 30(B) 40(C) 20(D) 2
Answer: (C) 20Look at the bar for Wed. Its top is on the line for 20, so 20 books. (30 is Monday.)

2. On which day were the most books borrowed?1 mark

Books Borrowed from the Library0102030405060MonTueWedThuFriNumber of books
(A) Monday(B) Thursday(C) Friday(D) Tuesday
Answer: (D) TuesdayThe tallest bar is Tue. Its top is at 50, so Tuesday.

3. How many more books were borrowed on Tuesday than on Wednesday?1 mark

Books Borrowed from the Library0102030405060MonTueWedThuFriNumber of books
(A) 30(B) 70(C) 20(D) 50
Answer: (A) 30Tuesday: 50. Wednesday: 20. How many more means subtract: 50 − 20 = 30. (70 comes from adding.)

4. How many boys are there in Class 4B?1 mark

Pupils in Four ClassesGirlsBoys0510152025304A4B4C4DNumber of pupils
(A) 15(B) 25(C) 40(D) 20
Answer: (B) 25Find 4B. The boys' bar (orange) reaches 25. (15 is the girls' bar.)

Section B · Write your answer 11 marks

5. How many books were borrowed from Monday to Friday in all?1 mark

Books Borrowed from the Library0102030405060MonTueWedThuFriNumber of books
Answer: 15030 + 50 + 20 + 40 + 10 = 150 books.

6. How many fewer books were borrowed on Friday than on Thursday?1 mark

Books Borrowed from the Library0102030405060MonTueWedThuFriNumber of books
Answer: 30Thursday: 40. Friday: 10. 40 − 10 = 30 fewer books.

7. On which day were half as many books borrowed as on Thursday?1 mark

Books Borrowed from the Library0102030405060MonTueWedThuFriNumber of books
Answer: WednesdayThursday: 40. Half of 40 = 40 ÷ 2 = 20. The bar at 20 is Wednesday.

8. How many girls are there in Class 4C?1 mark

Pupils in Four ClassesGirlsBoys0510152025304A4B4C4DNumber of pupils
Answer: 25Find 4C. The girls' bar (blue) reaches 25.

9. How many pupils are there in Class 4D?1 mark

Pupils in Four ClassesGirlsBoys0510152025304A4B4C4DNumber of pupils
Answer: 30Girls 10 + boys 20 = 30 pupils.

10. Which class has the most pupils? How many pupils are in that class?2 marks

Pupils in Four ClassesGirlsBoys0510152025304A4B4C4DNumber of pupils
Answer: Class 4C, 45 pupilsAdd girls and boys. 4A: 20 + 10 = 30. 4B: 15 + 25 = 40. 4C: 25 + 20 = 45. 4D: 10 + 20 = 30. The most is Class 4C with 45 pupils.

11. How many more boys than girls are there in the four classes in all?2 marks

Pupils in Four ClassesGirlsBoys0510152025304A4B4C4DNumber of pupils
Answer: 5Girls: 20 + 15 + 25 + 10 = 70. Boys: 10 + 25 + 20 + 20 = 75. 75 − 70 = 5 more boys.

12. Which class has twice as many girls as boys? Write the number of girls and boys.2 marks

Pupils in Four ClassesGirlsBoys0510152025304A4B4C4DNumber of pupils
Answer: Class 4A (20 girls and 10 boys)Twice as many means double. In 4A, the boys are 10 and the girls are 20, and 10 × 2 = 20. No other class works.
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