Full explanation given
Conversions usually have their roots in ratio
Did you know that you can and may write ratios in the format of a fraction. In such a case you must never loose sight of what the relationship is.
Consider the ratio
The thing is; that in this case we also have a link to the fraction side of things as 1 second is
If it is more convenient there is nothing to stop you writing this 'ratio' the other way up.
This is where the term 60 seconds per minute comes from.
Example: How many seconds are there in 35 minutes
So 35 minutes has 2100 seconds
How do we relate this to algebraic manipulation?
You can cancel units of measurement in the same way you do numbers