Accuplacer Practice Test

Write 1.5x10^10 in expanded form:

1. 1,500,000,000

2. 15,000,000,000

3. 1,500,000

4. 150,000,000

The correct answer is: 15,000,000,000

The given number is in scientific notation, which is a shorthand way to write numbers that are very large or very small. It consists of a number between 1 and 10 (1.5 in this case) and a power of 10 (10^10 in this case). To write it in expanded form, we multiply the number by 10 raised to the power. In this case, this would look like 1.5 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 = 15,000,000,000, or 15 billion. A 1,500,000,000 is incorrect because it is missing a zero in the expanded form. C: 1,500,000 is incorrect because it equates to 1.5 x 10 x 10 x 10 x 10 x 10, where the power is 5, not 10. D: 150,000,000 is incorrect because it equates to 1.5 x 10 x 10 x 10 x 10 x 10 x 10, where the power is 6, not