Question

If 100 cm id 1 m than how many cm are there are 13m

Answer 1

100 times 13 which is 1300, so in 13 m there is 1300 cm

Answer 2

The question requires you skills in doing multiplication or division. Ratio and proportion would also do here.
The topic here is about conversion.
You are given that 100 cm = 1m
Then how about 13 m?

100 cm : 1 m =  X : 13m
100 cm * 13m = 1m * x
1300 = 1m * X
X = 1300 cm

So 13m is equal to 1,300 cm