- elementary
- quadrilaterals
- a math trick-3
- triangle angle-sum theorem
- a triangle
- tux walks up and down...
- measuring angles...
- angles between parallels...
- area of a triangle
- area of a parallelogram
- area of a kite
- area of a trapezoid
- reflections...
- classifying triangles...
- reflections-2
- reflections-4
- find the area
- cartesian system
- axis of symmetry
- point of symmetry
- congruent triangles
- construction of a triangle (sss)
- Kaleidoscope
- a clock(2)
- supplementary angles
- find LCM and GCD
- quadrilaterals-2
- convex quadrilaterals
- a multiplication table
- equations and problems
- make an angle
- circumference of circles-1
- tangram puzzle-1
- multiplication table-1
- fraction αddition
- fraction division: a ÷ b (partitive)
- fraction multiplication
- comparing fractions
- subtraction of proper fractions
- russian multiplication
- a math trick-31
- ferris wheel
- wheel of fortune-1
- newton's disk
- a wheel of fortune-1
- fraction to decimal
- parallels or not?
- lines through a point
- rolling a dice
- egyptian system of numeration
- rolling two dice
