How to multiply decimals without calculator?

What is the result of converting 60 ounces to pounds remember there are 16 ounces in a pound

According to the 2008 u.s. census, california had a population of approximately 4 × 10^7 people and florida had a population of approximately 2 × 10^7 people. which of the following is true? a. the population of florida was approximately two times the population of california. b. the population of florida was approximately twenty times the population of california. c. the population of california was approximately twenty times the population of florida. d. the population of california was approximately two times the population of florida.

Plz ( true - false) all triangles have interior angles whose measure sum to 90.