31
Line graphs
Textbook: Part 1, lesson 31, pp. 96–98
GoalRead a line (strip) chart that shows the parts of a whole.
New words
line (strip) chart · chiziqli diagrammapart · qismwhole · butunkey (legend) · belgi
Explanation
In a line (strip) chart the data are drawn as horizontal strips. Each strip belongs to one object (for example a class) and is split into coloured parts; the parts add up to the length of the whole strip. A key tells which colour means what. In a bar chart, by contrast, each value has its own bar.
Worked examples
In the school garden class 4A planted 12 apple, 8 pear and 5 apricot saplings. The strip stands for 12 + 8 + 5 = 25 saplings.
Class 4B: 10, 9 and 6 (25 in all); class 4D: 14, 7 and 4 (25 in all). The three classes planted 36 apple saplings in total.
Class activity
“Colour strip”: children split a paper strip into coloured parts (for example hours of lessons, play and sleep in a day) and check that the parts add up to 24 hours.
Practice
1
Class 4A planted 12 apple, 8 pear and 5 apricot saplings. How many saplings does the whole strip stand for?
25
2
Apple saplings: 12 in 4A, 10 in 4B, 14 in 4D. How many apple saplings are there in all three classes?
36
3
Pear saplings: 9 in 4B, 7 in 4D. How many more are there in 4B?
2
4
Apricot saplings: 5 in 4A, 6 in 4B, 4 in 4D. Which class planted the most apricot saplings?
Class 4B