7900.
Since the 6 is greater than 5, you round up, but since you have a 90, you have to round that up, too.
It goes:
7896 rounds up
7899 round up
7900
I hope that helps.
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1000 metres = 1 kilometre so 7896 m = 7.896 km
88.8594395661
You divide the number of meters by 1000.
Nearest 10 of 254 = 250
No. 395 to the nearest 10 is 400.