Class 9th math 2.1 solution english PCTB

Note: This is the Solution of exercise 2.1 from newly published book by PCTB (Punjab Curriculum and Textbook Board, Pakistan) for new 9th session 2025 Onward.

Exercise 2.1

Question # 01: Express the following numbers in scientific notation.

\((i)\) \(\quad\) \(2000000 \)

\((ii)\) \(\quad\) \(48900 \)

\((iii)\) \(\quad\) \( 0.0042\)

\((iv)\) \(\quad\) \(0.0000009 \)

\((v)\) \(\quad\)\( 73 \times 10^3 \)

\((vi)\) \( \quad\) \(0.65 \times 10^2 \)

Question 2: Express the following numbers in ordinary notation.

\((i)\) \(\quad\) \(8.04 \times 10^2 \)

\((ii)\) \(\quad\) \(3\times 10^5 \)

\((iii)\) \(\quad\) \(1.5\times 10^{-2} \)

\((iv)\) \(\quad \)\(1.77 \times 10^7 \)

\((v)\) \(\quad\) \(5.5 \times 10^{-6} \)

\((vi)\) \(\quad\) \(4 \times 10^{-5} \)

Question 3: The speed of light is approximately \(3 \times 10^8 \) meters per second. Express it in standard form.

Question 4: The circumference of the Earth at the equator is about 40075000 meters. Express this number in scientific notation.

Question 5: The diameter of Mars is \(6.7779 \times 10^3\) km. Express this number in standard form.

Question 6: The diameter of Earth is about \( 1.2756 \times 10^4 \) km. Express this number in standard form.

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