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you can switch to "fraction calculator" in the highlighted menu:

you can use the built in "equation solver" to verify your solutions:

log4(16)

$${factorize}{\left({\mathtt{84}}\right)} = \left\{ \begin{array}{l}{\mathtt{4}} = {{\mathtt{2}}}^{{\mathtt{2}}}\\ {\mathtt{3}}\\ {\mathtt{7}}\\ \end{array} \right\}$$

22x-16=18x
beide Seiten: -18x
22x-16-18x=18x-18x
22x-18x-16=18x-18x
4x-16=0
beide Seiten: +16
4x-16+16=0+16
4x=16
beide Seiten: /4
4x/4=16/4
(4/4)*x=16/4
(1/1)*x=4
1*x=4
x=4


Probe:

22*4-16=18*4
88-16=72
72=72

it's the ÷ button.

Example fraction addition: 1/3 + 2/5

$${\frac{{\mathtt{1}}}{{\mathtt{3}}}}{\mathtt{\,\small\textbf+\,}}{\frac{{\mathtt{2}}}{{\mathtt{5}}}}$$

how to delete calculation history

now a "clear history" link is available in the expanded history dropdown

try using the circle formulas in the formulary section: