

1. 
Write 2,564,000 in scientific notation. 


A. 
2,564×10^{3} 
B. 
25.64×10^{5} 


C. 
2.564×10^{5} 
D. 
2.564×10^{6} 


Hint 


2. 
Which symbol makes the following statement true? 7,500 ______ 7.5 × 10^{3} 


A. 
= 
B. 
< 


C. 

D. 
> 


Hint 


3. 
The speed of light in a vacuum is exactly 299,792,458 meters per second. Write this number in scientific notation with the factor rounded to the hundredths place. 


A. 
3.00 × 10^{8} 
B. 
2.99 × 10^{10} 


C. 
3.00 × 10^{9} 
D. 
2.99 × 10^{9} 


Hint 


4. 
Write 6.2 × 10^{5} in standard form. 


A. 
62,000,000 
B. 
620,000 


C. 
62,000 
D. 
6,200,000 


Hint 


5. 
The Mojave Desert in southern California is 15,000 square miles. The Sahara Desert in northern Africa is about 233 times larger than the Mojave Desert. How big is the Sahara Desert? 


A. 
3.5 × 10^{4} sq mi 
B. 
3.5 × 10^{6} sq mi 


C. 
3.5 × 10^{3} sq mi 
D. 
3.5 × 10^{5} sq mi 


Hint 


