There are 78 because 78*100 = 7800
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7800 / 2 is equal to 3,900.
To the nearest hundred... 7800 - To the nearest hundredth... 7856.43
100 cm = 1 metre so 7800 cm = 7800/100 = 78 metres. Simple!
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.
7800