5+6=11         Five plus six is eleven.　　

10―2=8       Ten minus two is eight.　　

2×5=10       Two times five (Two multiplied by five) is ten.　　

9÷3=3         Nine divided by three is three.　　

a>b              a is more than b.　　

a<b              a is less than b.　　

a≈b            a approximately equals to b.

a≠b            a is not equal to b.