Question

Class 7 chapter 2 exercise 2.5 question 3

Answer 1

Answer:

Step-by-step explanation: i) Express 5cm in meter and kilometer.

       ∵   100cm = 1m

        ∴   1cm = 1\100m

       ⇒  5cm = 5\100 = 0.05m

 Now,  

             ∵  1000m = 1km

              ∴1m = 1\1000km

  ⇒   0.05m = 0.05\1000 = 0.00005km.

ii)Express 35mm in cm,m and km.

  ∵  10mm = 1cm

   ∴  1mm = 1\10cm

 ⇒   35mm = 35\10 = 3.5cm

Now,    ∵  100cm = 1m

             ∴  1cm = 1\100m

⇒  3.5cm = 3.5\100 = 0.035m.

Again,

         ∵  1000m = 1km

          ∴  1m = 1\1000km

  ⇒    0.035m = 0.035\1000 = 0.000035 km.