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π<sup>+</sup> has a [[Positive Charge|positive charge]]. This can be achieved with one [[Electrical Charge|charge]] of <math>+\frac{2}{3}</math> (an [[up-quark]]) and <math>+\frac{1}{3}</math> (an [[antidown-quark]]).
Since <math>+1 = +\frac{2}{3} + \frac{1}{3}</math>
Therefore <math>π^+ = u + \bar{d}</math>
K<sup>-</sup> has a [[strangeness]] of -1, therefore it contains a [[strange-quark]].
<math>-1 = -\frac{1}{3} + x</math>
K<sup>-</sup> has a [[Negative Charge|negative charge]]. This can be achieved with one its [[strange-quark]] with a [[Electrical Charge|charge]] of <math>-\frac{1}{3}</math> and another [[Electrical Charge|charge]] of <math>-\frac{2}{3}</math> (an [[antiup-quark]]).
Since <math>-1 = -\frac{1}{3} + -\frac{2}{3}</math>
Therefore <math>K^- = S + \bar{u}</math>