Less math functions are the methods which are used to perform numeric operations such as round, square root, power value, modulus, percentage etc.
A list of math functions used in Less:
Index 
Function 
Description 
Example 

1) 
It is used to round up the number to next highest integer. 
ceil(0.7) it round the number to:1 

2) 
It is used to round down the number to next lowest integer. 
floor(5.3) it round the number to:5 

3) 
It is used to transform the floating point number to percentage string. 
percentage(0.5): it is equivalent to 50%. 

4) 
It is used to round a floating point number. 
round(4.77): it converts the number to the rounding value as:5 

5) 
It is used to get the square root of a number. 
sqrt(36): it defines the square root of the number as: 6 

6) 
It is used to get the absolute value of a number. 
abs(30ft): it displays the absolute value as: 30ft 

7) 
It is used to get radian on numbers. 
sin(2): it calculates the sine value as: 0.90929742682 

8) 
it is used to return arcsine (inverse of sine) of a number which returns value between pi/2 and pi/2. 
asin(1):it calculates the asin value as: 1.5707963267948966 

9) 
It is used to get cosine of the specified value and determines radians on numbers without units. 
cos(2): it calculates the cos value as: 0.4161468365471424 

10) 
It is used to return arccosine (inverse of cosine) of a number which returns value between 0 and pi. 
acos(1):it calculates the acos value as: 0 

11) 
It is used to get tangent of the number. 
tan(60): it calculates the tan value as: 0.320040389379563 

12) 
It is used to get arctangent (inverse of tangent) of a specified number. 
atan(1): it displays atan value as: 0.7853981633974483 

13) 
It is used to get the pi value. 
pi(): it determines the pi value as: 3.141592653589793 

14) 
It is used to get the value of first argument raised to the power of second argument. 
pow(3,3): it specifies the power value as: 27 

15) 
It is used to get modulus of first argument with respect to the second argument. it also handles negative and floating point numbers. 
mod(7,3): it returns the modulus value as: 1 

16) 
It is used to get the smallest value of one or more arguments. 
min(70,40,55,10): it returns the minimum value as: 10 

17) 
It is used to get the highest value of one or more arguments. 
max(70,40,55,10): it returns the maximum value as: 70 