Question

Solve problems with very large and very small numbers, and write about scientific notation.
Earth’s diameter is approximately 12,760,000 meters.

What is that number in scientific notation?
1.276 × 10-7
12.76 × 10-6
1.276 × 107
0.1276 × 108

Answer 1

12,760,000 = 1.276 × 10^7.

Explanation: move the decimal 7 places left (12,760,000 → 1.276), so multiply by 10^7.
The other choices are either wrong values (1.276 × 10^-7, 12.76 × 10^-6) or not in normalized scientific notation (0.1276 × 10^8 = 1.276 × 10^7).