Settings

Night Night

Search History

LookBook

ISBN check
Want to learn how to check ISBN?

Do you know?
ISBN stands for International Standard Book Number

ISBN Formula:
10: 1x + 2x + 3x + 4x + 5x + 6x + 7x + 8x + 9x + 10x = 0 (mod 11)
13: x + 3x + x + 3x + x + 3x + x + 3x + x + 3x + x + 3x + x = 0 (mod 10)