Using continuous division method find the gcf and lcm of the following sets of numbers

What is the greatest common factor of 8 and 36

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?

What is 100,000 times 1/100,000, using the standard method of multiplication? write the answer as 10 to a power.