Conversion made easy
This chapter is a mix of several different thing
which is commonly used by students in competitive examination. The conversion
of one unit into different is taught in primary level but still we don’t use it
properly. Here we shall learn the conversion of –
1.
Temperature
2.
Km/h to m/s and
vice versa
3.
Kilometer to
Mile
4.
Pounds to
Kilograms
5.
Adding time
Temperature
Conversion of Celsius degree to Fahrenheit and
Fahrenheit to Celsius is simple if you learn the following formula-
0F
= 9/5 C + 32
0C
= (F – 32) × 5/ 9
The conversion of temperature using the above
formula involves a lot of calculation and is boring but there is no other
formula of conversion. So you can ask me whether there is any other short cut
method which help us to change the temperature scale if not exact than closer
to that. The answer is a big YES.
·
In order to
change the Fahrenheit to Celsius; subtract 32 degrees and then halve the
remainder.
·
To change
Celsius to Fahrenheit, double the value and add 30.
Example: - Change 720F to 0C
Solution: - Let’s do it first using the short cut
method and then using formula
Short Cut Method: - Subtract
32 = 72 – 32 = 40 Halve the result = 40 ÷
2 = 20
Using Formula: - 0C = (F – 32) × 5/ 9 = (72 – 32) × 5/9 = (40 × 5) ÷ 9 = 22.2
You can see that there is a slight variation in both
the result but as told earlier that you can easily estimate the result by the
short cut method.
Example: - Change 640F to 0C
Solution: - Let’s do it first using the short cut
method and then using formula
Short Cut Method: - Subtract
32 = 64 – 32 = 32 Halve the result = 32 ÷
2 = 16
Using Formula: - 0C = (F – 32) × 5/ 9 = (64 – 32) × 5/9 = (32 × 5) ÷ 9 = 17.7
You can see that there is a slight variation in both
the result but as told earlier that you can easily estimate the result by the
short cut method.
Example: - Change 120C to 0F
Solution:
- For changing the Celsius into Fahrenheit we need to change our calculation. First
using the short cut method and then using formula
Short Cut Method: - Double the value = 12 × 2 = 24
Add 30 = 24 + 30 = 54
Example: - Change 250C to 0F
Solution:
- For changing the Celsius into Fahrenheit we need to change our calculation.
First using the short cut method and then using formula
Short Cut Method: - Double the value = 25 × 2 = 50
Add 30 = 50 + 30 = 80
Using Formula: - 0F = 9/5 C + 32
= 9/5 × 25 +
32 = 45 + 32 = 77
This is pretty close to the exact value
which will serve our purpose of estimation.
Kilometer/hour to
meter/second
To change Km/h to m/s
multiply the result by 5/18.
To change m/s to Km/h
multiply the value by 18/5.
Example:
- Change 72 km/h to m/s
Solution: - Multiply 72
by 5/18 = 72 × 5 = 20 m/s 18
Example:
- Change 64 km/h to m/s
Solution: - Multiply 64
by 5/18 = 64 × 5 = 17.7 m/s 18
Example:
- Change 15 m/s into Km/h
Solution: - Multiply 15
by 18/5 = 15 × 18 = 54 Km/h 5
Example:
- Change 45 m/s into Km/h
Solution: - Multiply 45
by 18/5 = 45 × 18 = 162 Km/h 5
Kilometer to Mile
To convert Kilometer to
mile divide the value by 8 and multiply the result obtained by 5
Example;- Convert 80 Km
into mile
Solution:- Divide 80 by
8 = 80/8 = 10
Multiply by 5
= 10 × 5 = 50 mile
Example;- Convert 24 Km
into mile
Solution:- Divide 24 by
8 = 24/8 = 3
Multiply by 5
= 3 × 5 = 15 mile
Kilogram to Pounds
·
To change
kilogram to pounds multiply the result by 2.2. This can be simplified if you
multiply the kilogram by 2 and divide the answer by ten. Now add both the
result
·
To change pounds
to kilograms divide the result by 2.2
Example:
- Convert 65 Kg into Pounds
Solution: - 65 × 2.2 =
65 × 0.2 × 11 = 13 × 11 = 143
This can be done in
three steps in the following way.
Multiply the result by
2 = 65 × 2 = 130
Divide the value by 10
= 130 ÷ 10 = 13
Add the two result =
130 + 13 = 143
Example:
- Change 86 Kg into pounds
Solution: - Multiply 86
by 0.2 = 17.2
Multiply again by 11 = 17.2
× 11 = 189.2 pounds
Adding time
To add two times in
Hour and Minutes you don’t have to worry at all. Add them as you simply do in
addition. Once you have your answer, add 40 to it and you have the magical
figure.
Example;
Add 4 hours 34 minutes and 5 hours 57 minutes.
Solution: - Add 434 and
557
434 + 557 =991
Add 40 to it = 991 + 40
= 1031
Hence, 4 hours 34
minutes + 5 hours 57 minutes = 10 hours 31 minutes
Example;
Add 6 hours 24 minutes and 2 hours 57 minutes.
Solution: - Add 624 and
257
624 + 257 =881
Add 40 to it = 881 + 40
= 921
Hence, 6 hours 24
minutes + 2 hours 57 minutes = 9 hours 21 minutes
Hope you have enjoyed this blog and loved it ?
Please don't forget to send your valuable comments to
Rajesh Kumar Thakur
rkthakur1974@gmail.com
No comments:
Post a Comment