# Mathematical operations on variables in JavaScript

Mathematical operations can be performed not only on numbers, but on variables too. Let's add, for example, values of two variables:

`let a = 1; let b = 2; alert(a + b); // shows 3`

It is not necessary to display the result of the operation immediately, you can first write it to some variable, and only then display the value of this variable:

`let a = 1; let b = 2; let c = a + b; // write the sum to the variable c alert(c); // shows 3`

Create the variable `a` with the value `10` and variable `b` with the value `2`. Display their sum, difference, product, and quotient (division result).

Create the variable `c` with the value `10` and variable `d` with the value `5`. Sum them up and assign the result to the variable `result`. Display the value of the variable `result`.

Create the variable `a` with the value `1`, variable `b` with the value `2` and variable `c` with the value `3`. Display their sum.

Create the variable `a` with the value `10` and variable `b` with the value `5`. Subtract from `a` the variable `b` and assign the result to variable `c`. After, create the variable `d`, assign the value `7` to it. Add the variables `c` and `d`, then write the result to the variable `result`. Display the value of the variable `result`.

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