Accuplacer Practice Test

Convert 120,500,000,000,000,000,000 to Scientific Notation.

1. 1.205x10^20

2. 12.05x10^19

3. 120.5x10^18

4. 1.25x10^21

The correct answer is: 1.205x10^20

Scientific notation is a way of writing numbers that are very large or very small, using powers of 10. In this case, the number given is extremely large and can be written as 1.205x10^20 in scientific notation. This means that the decimal point is moved 20 places to the left, giving the number a power of 10. Option B would be incorrect because the decimal point is in the wrong place, making the number 10 times smaller. Option C would be incorrect because the decimal point is moved too far to the right, making the number 100 times smaller. Option D would be incorrect because the decimal point is in the wrong place, making the number 100 times larger.