# CLASS-8FUNDAMENTAL OPERATION ON DECIMAL

FUNDAMENTAL OPERATION ON DECIMAL

You are already familiar with the four fundamental operations ( Addition,  Subtraction, Multiplication and Division ) on decimals.

1)  Find the value of 1.457 + 234.25 + 23.478 + 25.127 = ?

Answer)                    1 . 4 5 7

2 3 4 . 2 5 0

2 3 . 4 7 8

+         2 5 . 1 2 7

----------------------

2 8 4 . 3 1 2

So, the desired answer is  2 8 4 . 3 1 2    (Ans.)

Example.2)  find the value of  23.457 + 0.247 + 249.78 + 3274.357 + 7.12 = ?

Answer)              2 3 . 4 5 7

0 . 2 4 7

2 4 9 . 7 8 0

3 2 7 4 . 3 5 7

+     7 . 1 2 0

--------------------

3 5 5 4 . 9 6 1

So, the desired result is  3 5 5 4 . 9 6 1    (Ans.)

Example.3)  Divide the product of 2.35 and 25.45 by 0.25

Answer.)  As per the given condition I have to find out the product of

2  5 . 4 5

X  2 . 3 5

----------------

1  2  7 . 2 5

7  6  3 . 5 X

5  0  9  0 . X

----------------------                                                                                                                                           5  9  8  0 . 7 5

So the obtained product of two given number is 5980.75, now we have to divide 0.25

So,     0.25 ) 5980.75 (

If we place decimal point to two steps ahead towards write side for both the dividend and divisor, then we find 25 as a divisor and 598075 as dividend.

So, now -          25 ) 598075 ( 23923

50

--------

98

75

--------

230

225

---------

57

50

--------

75

75

--------

0

Hence the required answer is 23923       (Ans.)