Question

Why use units with your number? Why is putting a unit with your number important?

Answer 1

Assume you need to know to what extent it will take you to get from your 
house to some other place. You ask me, and I say, "It will take 5." 
5 what? 5 minutes? 5 hours? 5 days? 
We utilize numbers to speak to stuff on the planet. Some of the time it's simply 
checking, e.g., 
I discovered 9 mushrooms today. 
I discovered 18 yesterday. 
So now I have 9 + 18 = 27 mushrooms. 
Yet, some of the time we're utilizing numbers to speak to things that we measure, 
like separations or weights or ranges: 
I have a board 12 feet long. 
I need to cut it into pieces 3 feet long. 
I can cut it into (12 feet)/(3 feet for each piece) = 4 pieces. 
We can utilize diverse methods for measuring something, e.g., 
I have a board 144 inches in length. 
I need to cut it into pieces 3 feet long. 
In the event that I simply isolate 144 by 3, without focusing on units, I get an 
reply of 48. In any case, what does it mean? It's an indistinguishable issue from 
some time recently, since 144 inches is an indistinguishable thing from 12 feet! So I would do well to 
find a similar solution - 4 pieces, not 48. To find a similar solution, I have 
to change my units: 
I have a board 144 inches in length. 
I need to cut it into pieces 36 inches long. 
I can cut it into (144 inches)/(36 inches per piece) = 4 pieces. 
So units are the means by which we ensure that our figurings about the world 

Answer 2

Answer:

Explanation:

When we measure a given physical quantity then after measurement we give the magnitude as well as unit along with the measurement

Here number gives the magnitude of the measurement what we did and unit gives an idea what unit is for the given measurement we used

Here unit is essential while we did any measurement because unit of the measurement may be different for different group of people but the quantity is always same when we compare them along with the unit

For example we know that

$1 ft = 12 inch$

here the numbers are different in two unit system but the quantity we compared is same.

so it is always essential to put units with all measurement to have complete idea of the quantity that is measured