Question

Express as cm using decimals. $ 9 $ cm and $ 8 $ mm

Answer 1

Hint: Convert the given value in the required specific units by using the conversion relation. Use the formula - $ 1mm = 0.1cm $ . Place the relation and simplify the equation using the basic mathematical calculations

Complete step-by-step answer:
We know that the basic relation between Millimetres and centimeters.
 $ 1\;mm = 0.1\;cm $
Place the value in the given value –
 $ 8\;mm = 0.8\;cm $ .... (A)
Take the given expression-
 $ 9 $ cm and $ 8 $ mm.
Simplify the above equation and place value from equation (A) –
 $ 9 $ cm and $ 8 $ mm $ = 9 + 0.8\;cm $
Simplify the above equation –
 $ 9 $ cm and $ 8 $ mm $ = 9.8\;cm $
So, the correct answer is “ $ 9.8\;cm $ ”.

Note: In physics, the units are the standards for the measurement of the physical quantities which needs to be clear to be useful. Units are the internationally accepted standards for measurements of the physical quantities.