# Pre-Algebra

1)(6.0 × 10 to the 5th power) × (3.0 × 10 to the 4th power)

A) 18 × 10 to the 20th power.
B) 18 × 10 to the 9th power.
C) 1.8 × 10 to the 20th power.
D) 1.8 × 10 to the 9th power.

2)(5 × 10 to the -2 power) ÷ (2 × 10 to the 3rd power)

A) 2.5 × 10 to the -5 power.
B) 2.5 × 10 to the -1 power.
C) 2.5 × 10 to the 1st power.
D) 2.5 × 10 to the 2nd power.

3)(2.56 × 10 to the 6th power) × (3.56 × 10 to the 2nd power)

A) 9.1136×10 to the 12th power.
B) 91.136×10 to the 8th power.
C) 9.1136×10 to the 8th power.
D) 91.136×10 to the 12th power.

4) In a recent near, the population of California was about (2.52 × 10 to the 7th power) people. It's land area is about (4.05 × 10 to the 5th power) Km to the 2nd power. What has the average number of people per square kilometers?

A) 0.62 × 10 to the 5th power.
B) 6.2 × 10 to the 1st power.
C) 0.62 × 10 to the 14th power.
D) 6.2 × 10 to the 9th power.

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1. A math tutor will be able to check your answers once you post them.

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2. 1. When multiplying, add the exponents:
6*10^5 * 3*10^4 = 18*10^9.

2.

3. 2.56*10^6 * 3.56*10^2 = 9.1136*10^8.

4. When dividing, subtract the exponent in the denominator from the
exponent in the numerator:
2.52*10^7/4.05*10^5 = 0.62*10^2 = 6.2*10^1.

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posted by Henry

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