Reading a graph is easier when every increment is labeled. However, most scales, thermometers, and rules don't have every line labeled.
When this happens, you need to count how many spaces are in between two numbers (above: 4) and divide by the increment that is labeled (above you can see where the graph counts by 20s).
Divide 20 into 4 spaces and you'll see that it counts by 5s up to 20, and then it counts by 5s up to 40, and so on. The "mystery increment" is counting by 5s.
When this happens, you need to count how many spaces are in between two numbers (above: 4) and divide by the increment that is labeled (above you can see where the graph counts by 20s).
Divide 20 into 4 spaces and you'll see that it counts by 5s up to 20, and then it counts by 5s up to 40, and so on. The "mystery increment" is counting by 5s.
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