Do you know for how many years the dinosaurs ruled the Earth? Or how much the hefty Argentinosaurus weighed? Which dinosaur ran 144 per cent faster than Usain Bolt? And do you know how many hours there were in a dinosaur say? Discover the answers to all these questions and much, more more in Big Countdown: Dinosaurs.

The Big Countdown looks at popular topics and investigates the great many numbers that make them fascinating. From the mind-bogglingly large to smallest and most precious, this series helps us understand that it's not just our days that are numbered. Perfect for number-crunchers aged 9 and up.

This book is part of a book series called The Big Countdown .

This book has been graded for interest at 9-11 years.

There are 32 pages in this book. This book was published 2018 by Hachette Children's Group .

Paul Mason is an experienced freelance writer and editor of a variety of children's information books.

This book has the following chapters:

• 1: Counting down the dinosaurs
• 2: Dinosaurs stalked the Earth for 66 billion, 65 million days
• 3: $8. 36 million: cost of a T-Rex
• 4: The heaviest dinosaur weighed 80, 000 kg - or more!
• 5: 1, 000 teeth lined the jaws of Nigersaurus
• 6: 800 dinosaurs still to be discovered
• 7: 540 species of dinosaurs that have been named
• 8: 64 kph: speed of the fastest dinosaur
• 9: 23 hours in a dinosaur day
• 10: 18 spines in a Spinosaurus's sail
• 11: 8 Celsius warmer on Planet Dinosaur than today
• 12: Two separate events wiped out the dinosaurs
• 13: The smartest dinosaur was about one-tenth as clever as a dolphin