Addition of two integers

5+5; // 10

Multiplication of two integers

5*5; // 25

If we add a number to a string, the number will be converted into a string and the result will be a concatenation of the two strings

5+'12'; // 512

String multiplied by an integer

5*'5'; // 25

Multiplication of a string (but not numeric string) and a number

5*'t'; // NaN

The first operation of the expression is addition and then concatenation

5+5+'2'; // 102