Strand: DATA ................................ ................................ ................................ ................................ ................................ .................... 107
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Subject: Mathematics
Class: Basic 5
Term: 3rd Term
Week: 13
Strand code: 1
Theme: DATA ................................ ................................ ................................ ................................ ................................ .................... 107
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In our daily lives, we often need to compare two groups or two situations. For example, we might want to know if boys or girls in our class prefer playing football more, or compare the amount of rainfall in Accra and Kumasi. A double bar graph is a powerful tool that helps us see these comparisons clearly and quickly on one chart. This lesson will teach learners how to build these graphs and understand the stories they tell. This skill is useful not just in mathematics, but also in science, social studies, and for making informed decisions in our community.
A. Recap: What is a Bar Graph? Remind learners that a bar graph uses single bars to show the quantity (how many) for different categories. For example, a bar graph can show the favourite fruit of learners in B5. Each fruit would have *one* bar showing how many learners chose it.
B. Introduction to Double Bar Graphs A double bar graph is a special type of graph that uses *pairs* of bars to compare two sets of data across the same categories. The bars in each pair are drawn side-by-side, and they are usually different colours or have different patterns to tell them apart.
C. When to Use a Double Bar Graph We use a double bar graph when we want to answer a question that compares two groups. Example 1: Comparing the favourite subjects of Boys and Girls in Grade 5. Example 2: Comparing the monthly sales of a kenkey seller in January and February. Example 3: Comparing the number of goals scored by Hearts of Oak and Asante Kotoko in different football seasons.
D. The Important Parts of a Double Bar Graph Every good double bar graph must have these five parts: Title: Tells us what the graph is about. (e.g., "Favourite Sports of B5 Learners"). Horizontal Axis (x-axis): This is the line at the bottom. It shows the categories you are comparing (e.g., Football, Netball, Ampe). Vertical Axis (y-axis): This is the line going up the side. It shows the quantity or frequency (e.g., Number of Learners). It must have a scale, which is a set of numbers (e.g., counting in 2s: 0, 2, 4, 6...). Pairs of Bars: For each category on the x-axis, there will be two bars next to each other. Their heights show the quantity for each of the two groups being compared. Key (or Legend): This is a small box that explains what each bar in the pair stands for. This is very important! Without a key, we don't know which bar is for which group. (e.g., 🟦 = Boys, 🟧 = Girls).