Kendra finds the dimensions of a sticky note. She uses a meter stick to determine that the dimensions are 1.25 × 10⁻⁸ meters wide by 2.5 × 10⁻⁶ meters long. Use scientific notation to write the dimensions in millimeters. Choose the correct answer from below (note: 1 meter = 1,000 millimeters):

Question

1.25 × 10⁻¹⁰ by 2.5 × 10⁻⁸
1.25 × 10⁻⁶ by 2.5 × 10⁻⁴
1.25 × 10⁻¹¹ by 2.5 × 10⁻⁹
1.25 × 10⁻⁵ by 2.5 × 10⁻³

Answer 1

To convert the dimensions from meters to millimeters, we multiply each dimension by 1,000.

Width: 1.25 × 10⁻⁸ meters × 1,000 = 1.25 × 10⁻⁸ × 1,000 = 1.25 × 10⁻⁸ × 10³ = 1.25 × 10⁻⁵ millimeters

Length: 2.5 × 10⁻⁶ meters × 1,000 = 2.5 × 10⁻⁶ × 1,000 = 2.5 × 10⁻⁶ × 10³ = 2.5 × 10⁻³ millimeters

So, the correct answer is 1.25 × 10⁻⁵ by 2.5 × 10⁻³.