Question

III Convert the following: -
a) 5 Km 20 m into m
b) 7 m 13 cm into m
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Answer 1

All you need to know is that a km is 1000 m ( as the prefix kilo always means 1000 let it be even 1kg and that is equal to 1000g )

also know

that a 100 cm is 1 m and that's cause the prefix centi is 10^–2 (0.01)

answering your question

a) 5km = 5000m

5km and 20m in m is 5000m + 20m = 5020m

b) 13 cm = 13/100m = 0.13m

7m and 12cm is 7m + 0.13m = 7.13m.

remember

1km = 1000m

100cm = 1m

hope this helped :)