The novel that everyone is reading for English class has half as many pages as their history book.  Their science book has 4 times the amount of pages as their novel.  If the history book has 300 pages, how many pages does their science book have?
How many pages is their novel? ** Their novel is half as long as their 300-page history book so it is 300/2 = <<300/2=150>>150 pages
How many pages does their science book have? ** Their science book has 4 times the amount of pages as their novel, which is 150 pages, so their science book has 4*150 = <<4*150=600>>600 pages
#### 600