How can you express 499 to find the product 499×5 using mental math explain

At a sale this week, a desk is being sold for $213. this is a 29% discount from the original price. what is the original price?

How can you find the mean absolute deviation (mad) for this set of data?

The volume of the sun is approximately 1 × 10^18 cu km, while the volume of jupiter is approximately 1 × 10^15 cu km. which of the following is true? a. the volume of jupiter is approximately one thousand times the volume of the sun. b. the volume of jupiter is approximately one hundred times the volume of the sun. c. the volume of the sun is approximately one thousand times the volume of jupiter. d. the volume of the sun is approximately one hundred times the volume of jupiter.