Question

Julie’s cell phone is 9 centimeters long. How many millimeters long is her cell phone

Answer 1

The answer is 90, there is 10 millimeters in 1 centimeter! So, if there is 9 centimeters, there will then be 90 millimeters!

Ps: I had my question up but someone reported it since I added a picture that would help you! :( 

Hope this does help though! You can always do the jumping trick with meters! That's how I learned :)