Question

The cost of bricks for the entire house is 23,000 dollars. Which of the following expresses this in scientific notation?

• A. $2.3\times {10}^3$
• B. $2.3\times {10}^4$
• C. $2.3\times {10}^5$
• D. $2.3\times {10}^6$

Answer 1

The correct option is B $2.3\times {10}^4$

The number should be expressed in the form

N $\times {10}^a$, where N is a number between 1 and 10 and 'a' is an integer.

In the number 23,000, decimal place should be placed after 2.

As the decimal is moved 4 times, value of a is 4

Hence, the number in scientific form is $2.3\times {10}^4$