NCERT Exemplar Solutions Class 8 Mathematics Solutions for Rational Numbers - Exercise in Chapter 1 - Rational Numbers

Question 171 Rational Numbers - Exercise

The numerical expression \frac{3}{8}+(-\frac{5}{7})=(-\frac{19}{56}) shows that _____.



Take the LCM of the denominators of the given rational numbers.

LCM of 8 and 7 is 56

Express each of the given rational numbers with the above LCM as the common denominator.





=\frac{21}{56}+-\frac{40}{56} … [[∵ denominator is same of both the rational numbers]]


As the answer is a rational number, we can say that rational numbers are closed under addition.

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