Kinyume cha namba: x⁻¹

2nd F pamoja na $\displaystyle x^{2}$ ni kinyume cha namba: $\displaystyle x^{-1}$. Andika 6, bonyeza , , na . Andika 7, bonyeza , , na . Matokeo ya $\displaystyle \frac{1}{6} + \frac{1}{7}$ ni $\displaystyle \dfrac{13}{42}$. inatoa 0.309523809.