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Primary 4 Mathematics · Chapter 4 · Answers and explanations

Lesson 4.3: Reading Line Graphs (answers)

Section A · Multiple choice 4 marks

1. What was the height of the plant in Week 4?1 mark

Height of a Bean Plant01020304050Week 1Week 2Week 3Week 4Week 5Week 6Height (cm)
(A) 35 cm(B) 30 cm(C) 40 cm(D) 45 cm
Answer: (A) 35 cmThe Week 4 point is halfway between the lines for 30 and 40. Halfway is 35 cm.

2. What was the height of the plant in Week 2?1 mark

Height of a Bean Plant01020304050Week 1Week 2Week 3Week 4Week 5Week 6Height (cm)
(A) 10 cm(B) 15 cm(C) 20 cm(D) 5 cm
Answer: (B) 15 cmThe Week 2 point is halfway between 10 and 20, so it is 15 cm.

3. In which week was the plant 45 cm tall?1 mark

Height of a Bean Plant01020304050Week 1Week 2Week 3Week 4Week 5Week 6Height (cm)
(A) Week 4(B) Week 6(C) Week 5(D) Week 3
Answer: (C) Week 5Find 45 cm, halfway between 40 and 50. The point at that height is above Week 5.

4. How much taller was the plant in Week 6 than in Week 1?1 mark

Height of a Bean Plant01020304050Week 1Week 2Week 3Week 4Week 5Week 6Height (cm)
(A) 55 cm(B) 40 cm(C) 50 cm(D) 45 cm
Answer: (D) 45 cmWeek 6: 50 cm. Week 1: 5 cm. 50 − 5 = 45 cm taller. (55 comes from adding.)

Section B · Write your answer 11 marks

5. What was the height of the plant in Week 3?1 mark

Height of a Bean Plant01020304050Week 1Week 2Week 3Week 4Week 5Week 6Height (cm)
Answer: 20 cmThe Week 3 point is on the line for 20, so 20 cm.

6. By how many centimetres did the plant grow from Week 2 to Week 3?1 mark

Height of a Bean Plant01020304050Week 1Week 2Week 3Week 4Week 5Week 6Height (cm)
Answer: 5 cmWeek 2: 15 cm. Week 3: 20 cm. 20 − 15 = 5 cm.

7. In which week was the plant first taller than 30 cm?1 mark

Height of a Bean Plant01020304050Week 1Week 2Week 3Week 4Week 5Week 6Height (cm)
Answer: Week 4Week 3 is 20 cm, which is not above 30. Week 4 is 35 cm, which is above 30. So Week 4.

8. How many visitors were at the pool on Wednesday?1 mark

Visitors at a Pool020406080100120140160MonTueWedThuFriSatNumber of visitors
Answer: 80The Wed point is on the line for 80, so 80 visitors.

9. On which days were there more than 100 visitors?1 mark

Visitors at a Pool020406080100120140160MonTueWedThuFriSatNumber of visitors
Answer: Thursday, Friday and SaturdayThu: 140, Fri: 120, Sat: 160 are all more than 100. Tuesday is exactly 100, so it is not more than 100.

10. How many visitors came to the pool from Monday to Wednesday in all?2 marks

Visitors at a Pool020406080100120140160MonTueWedThuFriSatNumber of visitors
Answer: 240Mon 60 + Tue 100 + Wed 80 = 240 visitors.

11. The pool hoped for 700 visitors from Monday to Saturday. How many more visitors were needed?2 marks

Visitors at a Pool020406080100120140160MonTueWedThuFriSatNumber of visitors
Answer: 40Read all 6 points: 60 + 100 + 80 + 140 + 120 + 160 = 660. 700 − 660 = 40 more visitors.

12. The plant's height in Week 6 is how many times its height in Week 1?2 marks

Height of a Bean Plant01020304050Week 1Week 2Week 3Week 4Week 5Week 6Height (cm)
Answer: 10 timesWeek 6: 50 cm. Week 1: 5 cm. 50 ÷ 5 = 10. So it is 10 times as tall.
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