Numbers and Maths

JavaScript is great with numbers. Unlike strings, numbers do not get quotes around them. You just write them plainly.

let apples = 5;
let price = 1.5;

Numbers can be whole (like 5) or have a decimal point (like 1.5). JavaScript treats them all the same way.

The maths operators

An operator is a symbol that does something to values. Here are the main maths ones:

• + add
• - subtract
• * multiply (the star, not the letter x)
• / divide
• % remainder (what is left over after dividing)

console.log(10 + 3);  // 13
console.log(10 - 3);  // 7
console.log(10 * 3);  // 30
console.log(10 / 3);  // 3.333...
console.log(10 % 3);  // 1  (10 divided by 3 leaves 1 left over)

Maths with variables

You can do maths with variables just like with plain numbers:

let apples = 5;
let pricePerApple = 2;
let total = apples * pricePerApple;
console.log(total); // 10

Try it yourself

Change the numbers and try each operator to see what you get.