TeX source:

\displaystyle\require{cancel}\begin{align}\lambda&=\frac{h}{mv}\\&= \displaystyle\frac{6.626\times10^{-34}\,\,\, \displaystyle\frac{\cancel{\text{kg}}\cdot\text{m}^{\cancel{2}}}{\cancel{\text{s}}}      } {\left(9.1\,\,\times\,\,10^{-31}\cancel{\text{kg}}\right)\left(2.2\,\,\times\,\,10^{6}\displaystyle\frac{\cancel{\text{m}}}{\cancel{\text{s}}}\right)} \\ \\ &=3.3\,\,\times\,\,10^{-10}\,\,\text{m} \end{align}