Question

Why does a measurement need both a 'number' and a 'unit' for its complete specification?

Answer 1

you are currently holding a mobile phone in your hand. if someone asks you to place a cover on it you would require the area of your phone

for area

$\boxed{\red{\tt area=length×breadth }}$

formula is used

for calculating length you would require a solitary number that is equal to the length of your phone.

but the length of your phone can be in mm, cm, km , etc. as these are the diff measurement units.

thus, you need a specified unit to specify the length and breadth of your phone and in turn the area.

more information

if you get the length and breadth as 5 and 2 respectively. the area comes out to be:

$\tt 5×2$

$\tt 10$

if you buy the phone cover as 10 mm² it would be very small and if you buy 10 km² it would be way to big. hence we require a number and a unit for complete verification

hope this helps!!

Answer 2

you are currently holding a mobile phone in your hand. if someone asks you to place a cover on it you would require the area of your phone

for area

Area = length × breadth

formula is used

for calculating length you would require a solitary number that is equal to the length of your phone.

but the length of your phone can be in mm, cm, km , etc. as these are the diff measurement units.

thus, you need a specified unit to specify the length and breadth of your phone and in turn the area.

hope it helps u..❤