四則運算係四樣最基本嘅數學算術運算，即係加減乘除。原則係：
6 × 6 − 11 + [ ( 5 + 36 ) + ( 5436 − 5411 ) − ( 66 − 11 ) ) ] − 22 ÷ 2 = ( 36 − 11 ) + [ 41 + 25 − 55 ] − 11 = 25 + 11 − 11 = 36 − 11 = 25 {\displaystyle {\begin{aligned}&6\times 6-11+[(5+36)+(5436-5411)-(66-11))]-22\div 2\\=&(36-11)+[41+25-55]-11\\=&25+11-11\\=&36-11\\=&25\end{aligned}}}
四則運算符號
![{\displaystyle {\begin{aligned}&6\times 6-11+[(5+36)+(5436-5411)-(66-11))]-22\div 2\\=&(36-11)+[41+25-55]-11\\=&25+11-11\\=&36-11\\=&25\end{aligned}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/c767af73fa4789535c036802699f7c1e57c466aa)
