Radioactivity Animation Play

Radioactivity Student activity Play

Rate of birth Student activity Play

Rate of birth Whiteboard exercise Play

Rational numbers Whiteboard exercise Play

Rational numbers Student activity Play

Reactions between Period 3 elements and water Whiteboard exercise Play

Reactions between Period 3 elements and water Whiteboard exercise Play

Reactions between Period 3 elements and water (1) Student activity Play

Reactions between Period 3 elements and water (2) Student activity Play

Recurring decimal Animation Play

Recurring decimals Animation Play

Recurring decimals Class activity Play

Recurring decimals Whiteboard presentation Play

Recurring decimals Student activity Play

Recurring decimals; period Student activity Play

Reduction formulas due to periodicity Whiteboard exercise Play

Reduction formulas due to periodicity Student activity Play

Refractory period Slideshow Play

Relationship between the period of revolution and the orbital radius Illustration Play

Root-mean-square current and voltage Simulation Play

Root-mean-square current and voltage Student activity Play

Root-mean-square current and voltage Whiteboard exercise Play

s-block elements Animation Play

Satellites Class activity Play