Study GuideBasic Math and Pre-Algebra–Graphs1. Bar Graphs1.1What Is a Bar Graph?Abar graphshows information using rectangular bars.Each bar represents a category (like a city, year, or company). The length or height of the bar showsthe amount.Usually:•One side lists thecategories(cities, companies, years).•The other side showsnumbers(like totals or amounts).When reading a bar graph, always ask:• What does each bar represent?• What units are being used?• What relationship is the question asking about?Example 1:Comparing CitiesThe bar graph shows thenumber of billboards in each city.The scale increases in increments of 100.From the graph:•City W≈500 billboards•City Y≈150 billboardsTo find how many more billboards City W has than City Y:So,City W has about 350 more billboards than City Y.Always estimate carefully using the scale shown.Preview Mode
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