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NCERT Solutions for Class 8 Maths Chapter 13 Direct and Inverse Proportions Exercise 13.1 is provided for the students in pdf format. Exercise 13.1 broadly covers the topic of direct proportions. The students must hence understand the meaning of the term direct variation which can be briefly summarized as
When the value of one quantity, say x, is dependent on the value of another quantity, say y, such that the value of x and y either increase or decrease together, then x is said to be in direct proportion with y. The x to y ratio hence remains a constant. Direct proportion is represented by the symbol ‘∝‘. Mathematically,
x/y = k
Where k is a constant.
Download PDF of NCERT Solutions for Class 8 Chapter 13 Direct and Inverse Proportions Exercise 13.1
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Example From Chapter 13 Direct and Inverse Proportions
| Ques. A colony of bacteria attained a length of 3cm when it enlarged 60000 times. Determine the length of the colony when the bacteria enlarged 10000 times only. Soln: Let us tabulate the given relation as follows:
Therefore, mathematically the relation can be expressed as 3/60000=x/10000 Hence, x=(3×10000)/60000 The value of x =½ cm Therefore, Length of bacteria = 0.5 cm. |
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| Class 8 Chapter 13 Direct and Inverse Proportions | ||
|---|---|---|
| Direct and Inverse Proportions | Proportion Formula | Direct and Inverse Proportions MCQs |
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| CBSE Class 8 Maths Study Guide | ||
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| NCERT Solutions for Class 8 Maths | Maths Formula | Maths Study Notes |
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