There are many idioms & proverbs which use topics & ideas from math. Let us see some of them.
Cardinal Numbers
Two is company; three is a crowd
It takes two to tango
One-way street
One way ticket
Put two and two together
Back to square one
A bird in hand is worth two in a bush
One tree does not make a forest
Kill two birds with one stone
Three cheers
The three Rs
As easy as one, two, three
Two heads are better than one
Give me five
A picture is worth a thousand words
One horse town
One track mind
Baker’s dozen
A catch 22
One in a million
A stich in time saves nine
On cloud nine
Ordinal Numbers
Third rate ….
First class
Sixth sense
Play second fiddle
Seventh heaven
The eleventh hour
Once in a blue moon
Second to none
Fractions
My better half
Operations
The mathematics of life is not the multiplication of wealth, but is the division of tasks, subtraction of greed and the addition of humility.
When things don't add up, start subtracting.
Divide and Conquer
Multiply like rabbits
Don't count your chickens before they hatch
Geometry
Going around in circles
A square meal
A square peg in a round hole
Point of no return
Fair and square
Love triangle
Measurements
A pound of flesh
Give an inch and he will take a mile
An ounce of prevention is worth a pound of cure