Probably the most commonly known phrases over time have dealt with math, or should we say, numbers. The list of sayings that include numbers can go on and on! The following lists only a few (we know you can add—for all Carl Sagan fans—“billions and billions” more):

One is the loneliest number.

It’s one per customer.

It takes two to tango.

A bird in hand is worth two in the bush.

Two’s company; three’s a crowd.

Three strikes and you’re out.

The third time’s a charm.

He’s six feet under.

It’s six of one, half a dozen of another.

She’s behind the eight ball.

She’s in seventh heaven; he’s on cloud nine.

A stitch in time saves nine.

A cat has nine lives.

It’s better to be judged by twelve than carried by six.

Nine times out of ten.