Question

if the length of black board is 50cm ,here 50 is​

Answer 1

the length of black board is 50cm ,here 50 is its length

Answer 2

Answer: Here, 50 is the multiplying factor and cm is the unit of length.

Explanation:

Any physical quantity is represented in terms of some defined units.

for example: for mass, we defined kilogram, gram, pound, etc.

For force, we defined newton.

Likewise, for length, we defined meter, centimeter, kilometer, etc.

Any length can be represented in terms of these units.

Like we can say this blackboard is 50 times the length of 1cm.

Here, 50 is the multiplying factor and cm is the unit of length.