Describing position on the city plan Whiteboard exercise Play

Describing position – part 1 Student activity Play

Describing position – part 2 Student activity Play

Determination of the number of erythrocytes Animation Play

Determining the empirical formula Animation Play

Determining the number of bacteria in a sample Animation Play

Determining the proportions of matter in the ecological pyramid Animation Play

Diagonals of polygons Student activity Play

Different angles Student activity Play

Different questions Whiteboard exercise Play

Different questions about the same operation Whiteboard exercise Play

Different questions about the same operation. How many times more? How many times less? Student activity Play

Different questions about the same operation. How much more? How much less? Student activity Play

Different vector equations of the same line Animation Play

Different ways of proving Animation Play

Different ways of proving – example as a proof Whiteboard exercise Play

Direct proportionality models Student activity Play

Disorders related to abnormalities in the number of sex chromosomes Slideshow Play

Distance from a point to a line Student activity Play

Distance from a point to a line Simulation Play

Distance on the map Animation Play

Divide a plane into half-planes Student activity Play

Dividing a line segment Student activity Play

Dividing a line segment Simulation Play

Dividing a plane into half-planes Whiteboard exercise Play