196k views
5 votes
Which answer shows 9 x 10 ^ -5 written in standard form ?

A -0.000009
B -0.00009
C 0.0009
D 0.00009

User John Ken
by
8.3k points

1 Answer

1 vote

Answer:

D 0.00009

Explanation:

9 × 10^-5 = 9 × 1/10^5 = 9 × 1/100,000

= 9 × 0.00001

= 0.00009

_____

Comment on place value

The exponent of 10 associated with the place value in a decimal number increases from 0 to the left of the decimal point, and decreases from -1 to the right of the decimal point:

100. = 10²

10. = 10¹

1. = 10⁰

0.1 = 10⁻¹

0.01 = 10⁻²

0.001 = 10⁻³

0.0001 = 10⁻⁴

0.00001 = 10⁻⁵

This simple realization can help you immensely with scientific notation.

User Silexcorp
by
8.4k points
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.