Ok so. We know hectometers are bigger than kilometers, right? So, here is is something to help you:
1 km = 10 hm
2 km = 20 hm
3 km = 30 hm
4 km = 40 hm
5 km = 50 hm
6 km = 60 hm
7 km = 70 hm
8 km = 80 hm
9 km = 90 hm
10 km = 100 hm
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It's counting by 10's. The list goes on and on.
Hope This Helps!!!