Friday, 17 February 2012

Time in terms of unit fractions

Hello children.  Today in our free math help session we are going to learn about how to do fractions and mainly Time in terms of unit fractions.
When we talk about time, it is expressed in form of hours and minutes. We can also write Time in unit fractions. Here are certain examples:
We know an hour contains 60 minutes,
So, Half of an Hour is expressed as (1/2) = 30 minutes
So if we write 1 hour thirty minutes it can also be written as one and a half hour. It is also called Half Past 1
Similarly Half past two is written as 2: 30 or we also call it two and a half hours. If we talk about 15 minutes, it is one fourth of an hour, so it is expressed as 1/4. When we write quarter past 3, it is 3: 15 or we can call it 3 and 1/4 hours.
Now we talk about 45 minutes. 45 minutes of 1 hour is 3/4 of an hour. So when the time is quarter to 5, it can be written as 4: 45, or we can even call it 4 and 3/4 of an hour.
Various fractional calculations can be done on time.
Now let us see that how the two fraction times are added up:
We have just learned that 15 minutes can be written as 1/4
Now we see that 15 min + 15 min makes  30 minutes , on other hand we can write it in form of fraction addition as
 = (1/4 ) + ( 1/4)
 = ( 2 / 4)
Now converting it to lower terms we get
= 1/2.
Again we come to a conclusion that 1/2 = 30 minutes which is also true another way.

In upcoming posts we will discuss about Add subtract simple fractions and Probability and Statistics. Visit our website for information on Logic Tamilnadu Board Sample Paper

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