Dandin's mathematical treatise is called Ganita-Sara-Sangraha, which means 'Compendium of Mathematical Principles'.

The Ganita-Sara-Sangraha primarily focuses on arithmetic, including topics such as addition, subtraction, multiplication, division, fractions, and square roots.

Dandin introduced the concept of negative numbers in the Ganita-Sara-Sangraha, making him one of the first mathematicians to do so.

Dandin provided a formula for finding the square root of a number, which is (\sqrt{a} = \frac{a}{4}).

Dandin used the method of completing the square to solve quadratic equations.

Dandin employed continued fractions to solve indeterminate equations.

Dandin studied the properties of circles in the Ganita-Sara-Sangraha.

Dandin gave the formula for the circumference of a circle as (2\pi r).

Dandin proved the Pythagorean theorem in the Ganita-Sara-Sangraha.

Dandin approximated the value of (\pi) as (\frac{22}{7}) in the Ganita-Sara-Sangraha.

Dandin employed the method of exhaustion to determine the volume of a sphere.

Dandin gave the formula for the volume of a sphere as (\frac{4}{3}\pi r^3).

Dandin utilized Brahmagupta's formula to compute the area of a triangle.

Dandin gave the formula for the area of a triangle as (\frac{1}{2}bh), where (b) is the base and (h) is the height.

Dandin employed the method of exhaustion to determine the volume of a pyramid.