Grade 3Math
Combined Bar GraphsPut two graphs into one, and compare the classes
We combine the bar graphs of favorite games for Class 1 and Class 2 into one graph. The bars for the same game stand next to each other, so it is easier to read the differences between the classes and which games are popular in both classes.
The narration and the pictures are in Japanese. You can hear the same words that are used in class at a Japanese school.
- Video
- 1:23（6 scenes）
- Problems
- 3 problems
Open this lesson in Japanese（組み合わせた 棒グラフ）
Let's try
Write the math sentence in your notebook first, then open the answer.
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1In the combined bar graph, which class has more people for hide-and-seek, and how many more?
Hint
Read the tops of the two hide-and-seek bars next to each other with the scale marks on the left.
Answer
Class 1 has 3 more people. Class 1 has 5 people and Class 2 has 2 people, so 5 − 2 = 3.
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2For musical chairs, which has more people, Class 1 or Class 2?
Hint
Compare the heights of the two bars next to each other that have different colors.
Answer
Both have 7 people, so they are the same. The two bars next to each other are the same height.
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3Looking only at Class 2, which game is the most popular?
Hint
Check the color for Class 2 in the color key, and look only at the bars of that color.
Answer
It is musical chairs (7 people). Look only at the orange bars with stripes, and find the tallest one. It is different from drop the handkerchief, the most popular game in Class 1.
Words in this lesson
- combined bar graph 組み合わせた 棒グラフ
- A graph that puts several bar graphs together into one. The bars for the same game stand next to each other.
- color key 色の 見本
- The marks written to the right of the graph that show which color of bar is which class.
- bars next to each other となりの 棒
- Bars for the same game but for different classes. When you compare their heights, you can see the difference between the classes.
For parents and guardians
- The names of lessons and the order of topics differ slightly between textbooks. This page follows the content of Japan's national curriculum guidelines (the Course of Study). The numbers of people for each game were made up for this material and are not the results of a real survey.
- In a combined bar graph, the bars for the same item stand next to each other, so you can read at once the differences between classes (the difference in height of bars next to each other) and features shared by both classes (bars that are tall in both). The tip is to first check the colors of the bars and the color key beside the graph.
- When your child reads the graph, try encouraging them to first check "which color is which class" and "what one division stands for," and then compare the bars next to each other. Rather than whether your child can draw a combined graph from a table on their own, we put importance first on reading the graph and being able to put what they notice into words.