Math 7 · Unit 2, Lesson 7: Circle Graphs · Tile 3 of 3
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From a slice to a count
Sometimes the graph gives you a slice in degrees and you want the count. Degrees to percent, then percent of the whole group.
Phones sold
A store sold 2,400 phones. On the circle graph, the slice for one model is 54 degrees. 54 out of 360 is 0.15, which is 15 percent. Then 15 percent of 2,400 is 360. The store sold 360 of that model.
To find a count from a sector, find its percent of 360, then take that percent of the total.
Degrees to percent, then percent of the whole group.
Where this goes next
One sentence about Unit 3. A percent decrease is a change that goes down, and so far we have said down with a word. Unit 3 gives that kind of change a sign: a decrease becomes a negative number, and the rules for adding and multiplying with negatives take over from here.
NC standards: NC.7.RP.3.