This document contains examples and explanations of several math concepts in Indonesian including: addition, subtraction, multiplication, division, variables, area and perimeter of triangles, kites, and circles, fractions, percentages, factors, time, interest formulas, distance, speed, time formulas, and gross weight, net weight, and tare weight. It provides worked examples and formulas for calculating things like the area of triangles as 1/2 base x height, perimeter as the sum of the three sides, and the area of a circle as π x radius squared.