CBSE Class 7 Answered
how can we do subtraction of rational numbers
Asked by ashwinimohine39 | 18 Dec, 2022, 12:29: PM
Hint
Subtraction is a reverse process of addition.
To subtract or add rational numbers, we have to make the denominator same by taking LCM, wherever required.
Example:
![3 over 4 minus 2 over 5](https://images.topperlearning.com/topper/tinymce/cache/acd43392e1b2a7a19bf7e3e8b8190a99.png)
In the above expression, the denominators are different. Take LCM of 4 and 5, i.e. 20 and simplify the expression
![3 over 4](https://images.topperlearning.com/topper/tinymce/cache/1db3ffb76dbf2a465290ee830bc3f1e4.png)
![15 over 20](https://images.topperlearning.com/topper/tinymce/cache/b18b426fca620c14911e085fb8fefb8b.png)
![2 over 5](https://images.topperlearning.com/topper/tinymce/cache/74070d5c4245410ba82058b40c668ff8.png)
![8 over 20](https://images.topperlearning.com/topper/tinymce/cache/7ea8f5feca3796e74d723c82f5be0ed9.png)
![15 over 20 minus 8 over 20
7 over 20](https://images.topperlearning.com/topper/tinymce/cache/10c8a2763689a0a7077263db8a24861a.png)
Answered by | 18 Dec, 2022, 17:25: PM
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