for question 1= 1 cm = 100 m
? = 2.50 m
then cross multiply = 1 cm ×2.50 m/100 m
= 5 cm/ 2
=2.5 cm
so the answer is there are 2.5 cm in 2.50 m
for question 2= 1 km = 1000 m
?=2.50 m
then cross mutiply= 1 km × 2.5 m/ 1000 km
0.0025 km
so the answer is there is 0.0025 km in 2.50 m
hope i helped