Decimals are very significant in the world of mathematics, with the help of decimals we can solve any fraction up to its last limit, and in finding percentage they play a very important role. Decimal is generally a tenth part of any decimal number (you can also use decimal to fraction calculator). We can perform many operations on decimal numbers like addition, subtraction and division. We can represent fractions in decimals by just dividing the numerator by denominator. Now we will see how we can Solve Decimals problems (refer this for more info on decimals).
Example: Add 12.1 + 13.43
Solution: for addition we need to check the digits after decimal, if number of digits is equal then we can simply add them but if number of digits is not equal then we need to equalize the digit then only we can add. For equalizing the digit we can simply add the zero after decimal, as zero has no importance after decimal but you can put the zero after the digit not before the digit. So we can write the above equation as
12.10+ 13.43
=25.53
In this way we can add decimals. In the same way we can also do subtraction with the decimals.
We will see an example of multiplication of decimal number (improve your skills by finding, is a repeating decimal a rational number).
Example: multiply 12.3 with 3.2
Solution: like addition we don't need to equalize the number after. For the above question we need to firstly multiply 2 with 12.3 and then we will multiply 3 with 12.3, when we will multiply 2 with 12.3 we will get 246 and on multiplying 3 with 12.3 we will get 369 now we will add them like
246
+369*
So we will get 3936 now we need to put decimal after two digits so required answer will be 39.36.
In the same way we can also perform division operations.
In upcoming posts we will discuss about Multiplication/division - inverse relationship and Order of Operations in Grade V. Visit our website for information on CBSE class 12 home science question bank
Example: Add 12.1 + 13.43
Solution: for addition we need to check the digits after decimal, if number of digits is equal then we can simply add them but if number of digits is not equal then we need to equalize the digit then only we can add. For equalizing the digit we can simply add the zero after decimal, as zero has no importance after decimal but you can put the zero after the digit not before the digit. So we can write the above equation as
12.10+ 13.43
=25.53
In this way we can add decimals. In the same way we can also do subtraction with the decimals.
We will see an example of multiplication of decimal number (improve your skills by finding, is a repeating decimal a rational number).
Example: multiply 12.3 with 3.2
Solution: like addition we don't need to equalize the number after. For the above question we need to firstly multiply 2 with 12.3 and then we will multiply 3 with 12.3, when we will multiply 2 with 12.3 we will get 246 and on multiplying 3 with 12.3 we will get 369 now we will add them like
246
+369*
So we will get 3936 now we need to put decimal after two digits so required answer will be 39.36.
In the same way we can also perform division operations.
In upcoming posts we will discuss about Multiplication/division - inverse relationship and Order of Operations in Grade V. Visit our website for information on CBSE class 12 home science question bank
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