Math 9th Ex 2.1 | New book
Math 9th Ex 2.1 new book 2025 will be completely solved. Scientific notation and ordinary notation will be explained.
A number is scientific notation is written as: $$a\;\times\;10^n,\;where\\1\leq a<10\;\;and\;\;n\in\mathbb{Z}$$
After the solution of this exercise, we will completely solve exercise 2.2, exercise 2.3, exercise 2.4 and review exercise 2 also. In this series, we will also check how to find the log of any positive number not only with the help of calculator but also by using logarithmic table. We will concentrate on how to check mantissa properly with the help of log table. At the end of this series, we will solve all the MCQs in full detail and also try to understand all the concepts of whole chapter 2 math class 9 new book. Calculation will be according to the 4 decimal places.
Lets start Math 9th Ex 2.1 New book.
Q1 Express the numbers in scientific notation:
(i) 2000000
$$2.0\;\times\;10^6$$
(ii) 48900
$$4.89\;\times10^5$$
(iii) 0.0042
$$4.2\;\times10^{-3}$$
(iv) 0.0000009
$$9.0\;\times\;10^{-7}$$
(v) $$73\;\times\;10^3$$
Question is important because it looks like as its in scientific notation but actually its not in Scientific notation. To clear this concept check the definition of scientific notation in the introduction.
$$73\;\times\;10^3\\=\;7.3\;\times\;10^3\;\times\;10^1\\=\;7.3\;\times\;10^{3+1}\\=\;7.3\;\times\;10^4$$
(vi) $$0.65\;\times\;10^2$$
Question is not in Scientific notation. Kindly check the definition of scientific notation in the introduction.
