Recurring decimals; period Student activity Play

Reduction formulas due to periodicity Whiteboard exercise Play

Reduction formulas due to periodicity Student activity Play

Reflection symmetry in the coordinate system in the x-axis and the y-axis Student activity Play

Refractory period Slideshow Play

Relationship between the atomic structure and the position of elements in periods Animation Play

Relationship between the group number and the number of valence electrons Animation Play

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

Relative atomic mass Whiteboard presentation Play

Relative atomic mass Class activity Play

Relatively prime numbers Whiteboard exercise Play

Reversing the percentage change Student activity Play

Rolling 6 Animation Play

Rolling a die Animation Play

Rolling a die Whiteboard exercise Play

Rolling a number greater than or equal to 7 Whiteboard exercise Play

Rolling an odd number Whiteboard exercise 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

Rounding a number Animation Play

Rounding decimals Student activity Play

Rounding decimals Whiteboard exercise Play

Rounding decimals to 0.01 Student activity Play

Rounding decimals to 0.1 Student activity Play