Their novel is half as long as their 300-page history book so it is 300/2 = <<300/2=150>>150 pages

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

# Answer

600
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
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?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
600
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?
train