Students can Download Maths Chapter 7 Rational Numbers Ex 7.2 Questions and Answers, Notes Pdf, KSEEB Solutions for Class 8 Maths helps you to revise the complete Karnataka State Board Syllabus and score more marks in your examinations.
Karnataka Board Class 8 Maths Chapter 7 Rational Numbers Ex 7.2
Question 1.
Write down ten rational numbers which are equivalent to \(\frac { 5 }{ 7 }\) and the denominator not exceeding 80.
Answer:
Multiply both numerator and denominator by 2, 3, 4………
\(\frac{10}{14}, \frac{15}{21}, \frac{20}{28}, \frac{35}{35}, \frac{30}{42}, \frac{35}{49}, \frac{40}{56}, \frac{45}{63}, \frac{50}{70}, \frac{55}{77}\)
Question 2.
Write down 15 rational numbers which are equivalent to \(\frac { 11 }{ 5 }\) and the numerator not exceeding 180.
Answer:
\(\begin{array}{l}{\frac{22}{10}, \frac{33}{15}, \frac{44}{20}, \frac{55}{25}, \frac{66}{30}, \frac{77}{35}, \frac{88}{40}, \frac{99}{45}} \\ {\frac{110}{50}, \frac{121}{55}, \frac{132}{60}, \frac{143}{65}, \frac{154}{70}, \frac{165}{75}, \frac{176}{80}}\end{array}\)
Question 3.
Write down 10 positive rational numbers such that the sum of the numerator and the denominator of each is 11. Write them in decreasing order.
Answer:
Question 4.
Write down ten positive rational numbers such that numerator – denominator for each of them is -2. Write to them in increasing order.
Answer:
Numerator – denominator = – 2
therefore the denominator is greater than the numerator by 2.
\(\frac{1}{3}, \frac{2}{4}, \frac{3}{5}, \frac{4}{6}, \frac{5}{7}, \frac{6}{9}, \frac{7}{9}, \frac{8}{10}, \frac{9}{11}, \frac{10}{12}\)
Question 5.
Is \(\frac { 3 }{ -2 }\) a rational number? If so, how do you write it in the form conforming to the definition of a rational number (that is, the denominator as positive integer)?
Answer:
\(\frac{3}{-2}\) is a rational number because the denominator is negative.
It can be written as \(\frac{3}{-2}\) since \(\frac{3}{-2}\) is same as \(\frac{3}{-2}\)
Question 6.
Earlier you have studied decimals 0.9, 0.8, can you’ write these as rational numbers?
Answer:
\(0.9=\frac{9}{10} \text { and } 0.8=\frac{8}{10}=\frac{4}{5}\)