The number halfway between 7800 and 8200 can be found by calculating the average of the two numbers. Adding 7800 and 8200 gives a total of 16000. Dividing this sum by 2 gives the number 8000, which is the halfway point between 7800 and 8200.
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8,200
Calculate the difference between each number and the next number. Write them down. It should be quite obvious from there.
8200
0.0002
820