Note the first one given to you. 2.54 centimeters = 1 inches
The next one is 5.08 To solve, divide by 2.54:
5.08/2.54 = 2
2 inches is your answer
To solve the next one, 10 inch, multiply by 2.54
10 x 2.54 = 25.4
25.4 centimeters is your answer
hope this helps