▢ Tally marks. Tally marks are the easiest way to count things. You just make a mark for each item, and after five marks, you draw a diagonal line to group them. It's like counting on your fingers., ▢ Pictographs. Pictographs use pictures to represent data. If you want to show how many of your friends like different fruits, you can use smile pictures. The more smile pictures you put, the more friends who like the fruit., ▢ Bar graphs. Bar graphs are a bit more complex. You can use bar graphs to show the favourite colour of your friends. You can use colourful bars to show the number of friends who like each color. The taller the bar, the more friends like that colour., ▢ Pie charts. Pie charts show data in a circle. They're like dividing a pizza into slices. Each slice represents something, like the number of pets people have. The bigger the slice, the more pets people have of that kind., ▢ Line graphs. Line graphs are a bit trickier. They're used to show how something changes over time. For example, if you want to know how the temperature changes throughout the day, you can use a line graph. It connects the dots to make a line that goes up and down.,

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