Vidyarthi Academy

Home NCERT Solutions Chapter Notes Test Papers Contact Us

NCERT SOLUTIONS CLASS 9 MATHEMATICS

Exercise 1.5

Q.1. Classify the following numbers as rational or irrational:

i 2 - 5      ii 3 + 23- 23

iii 2777        iv 12     v 2π

Q.2. Simplify each of the following expressions:

i 3 + 32 + 2  ii 3 + 33 - 3

iii 5 + 22             iv 5 - 25 + 2

Q.3. Recall, π is defined as the ratio of the circumference (say c) of a circle to its diameter (say d). That is, π = cd. This seems to contradict the fact that π is irrational. How will you resolve this contradiction?

Q.4. Represent 9.3 on the number line.

Q.5. Rationalise the denominators of the following:

i17          ii17-6

iii15+2         iv17-2