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A whole step is two half steps added together. To simplify, it is two notes upward or two notes downward. For example, let's once again look at the illustration above. Locate Middle C, go two keys upward or to the right; first key will be a black key (C# or Db), second key will be a white key (D), that's a whole step. Let's say you are on F, move two keys downward or to the left, first key will be a white key (E or Fb), second key will be a black key (Eb or D#), that's a whole step.