These are called "class numbers".
Class numbers are useful because they tell us what the book's about (the subject). Every subject has its own class number (it's a sort of code, but we don't keep it a secret). We put the books on our shelves in number order, starting at 000 and ending in 999, to help you find what you're looking for -- all the books on dogs are in one place, the books on the weather in another place and joke books somewhere else.
Here's a few examples:
- Bats are J599.4
- Castles are J728.81
- Disasters are J904
- Dogs are J636.7
- Dreams are J154.634
- Maps and atlases are J912
- Pirates are J910.4
- Relationships are J301.41
- Tractors and diggers are J629.225
Don't worry: you don't have to learn all the numbers by heart (we haven't!)
Story books don't have class numbers. We put these books on our shelves in "author order" (authors are people who write books) starting with the people whose surnames begin with the letter A and ending with the people whose surnames begin with the letter Z.
What do you call a baby cat that works at the doctor's?
A first aid kit!
What's red and goes up and down?
A tomato in a lift!
What's green on top and yellow underneath?
Last week's custard!
"Would you like your pizza cut into six or four?"
"Just four, please. I don't think I could eat six!"
What howls at the moon in frilly knickers?
An underwearwolf!
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