Question

Is 3 decimeater less than 30 centimeters

Answer 1

3 decimeter is the same as 30 centimeters, because 1 decimeter=10 centimeter, so if you convert 3 decimeter into centimeters, you'll get 30, 3×10=30cm 

30cm=30cm, so your answer is both are equal. 
hope this helps...........