Bingo is a relatively simple game to understand but to be able to check a number of cards at 1 time takes practice and serious players can check a number of cards during each games.

A very simple explanation of how bingo works is as follows.
Players have a bingo card that has random number on it, a bingo caller calls out numbers at random that come out of the bingo callers machine. The players then cross/mark off the numbers that get called out and once a player completes a line or fills all their numbers on the bingo card they call "Bingo". The first person to call "Bingo" and have their card verified as the winner wins.

If however you want a more detailed guide of how to play bingo then read on...
In America Bingo cards are set out as 5 rows and 5 columns (in many cases with a letter from the word BINGO spelt above it). Each square has a number in it, usually in the "B" line have numbers ranging from 1-15, the "I" line has 16-30, the "N" line has 31-45, the "G" line has 46-60 and the "O" line has 61-75. There is also a "Free Space" in the very center on the "N" line.

A UK Bingo card looks slightly different, it has 3 rows and 9 columns. Each column going from left to right has 1, 2 or 3 numbers in it, with the first column having numbers 1-9, the next have 10-19 then the next 20-29 etc. all the way up to 90.

There are thousands of uniquely numbered bingo cards so the chances of finding yourself having the very same numbers as any other player are very small!
There are also sheets with up to 6 sets of bingo cards on that you can play all at the same time, these are for bingo players who can check and mark off their numbers fastest. Obviously the more cards you play the more it will cost you each game but also the odds of winning are increased with the more you play!

The caller usually gets a number from their machine (either electronic or manual) and shouts the number out. Quite often on popular numbers the caller will announce the numbers nickname before he says the number! The numbers may also be displayed electronically to make sure no one misses a number.

The players mark the numbers off on their card, many players use a "Bingo Dabber" or marker to mark the numbers they have on their bingo card. Proper Bingo Dabbers have a thick end so they just bneed to be "dabbed" onto the card to make the mark.