Chapter 3

The World of Numbers

CBSE Class 9

Mathematics Solutions

Question:

Find the sum:

(A) $\frac{2}{5} + \frac{3}{10}$

(B) $\frac{7}{12} + \frac{5}{8}$

(C) $\frac{-4}{7} + \frac{3}{14}$ [Page No. 49]

Answer: Verified

$10. \text{ (A) } \frac{2}{5} + \frac{3}{10}: \frac{4}{10} + \frac{3}{10} = \frac{7}{10}$

$(\mathbb{B})\frac{7}{12}+\frac{5}{8}:\frac{14}{24}+\frac{15}{24}=\frac{29}{24}$

$(C)\frac{-4}{7}+\frac{3}{14}:\frac{-8}{14}+\frac{3}{14}=\frac{-5}{14}$

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(All Q's of this Chapter solved)

More NCERT Questions

Try to extend this method for constructing line segments of lengths sqrt(3) and sqrt(5) using a ruler and a compass. Generalise this method to construct a line segment of any length of the form sqrt(n Consider this puzzle: What is the square root of -1? We know that 1 × 1 = 1. We also know that (-1) × (-1) = 1. There is no real number that, when multiplied by itself, results in a negative number. T The decimal expansion of p/q will be terminating precisely when the prime factors of q are only 2, only 5, or both 2 and 5. Can you explain why? [Page No. 58] Try to find the decimal expansions of 10/3 and 11/12. What do you observe about the repetition of the digits after the decimal point? [Page No. 57]