Adding method to Object

const math = {
    add: function(x,y){
        return x+y;
    },
    multiply: function(x,y){
        return x*y;    
    },
    sub: function(x,y){
        return x-y;
    },
    numbers: [1,2,3,4,5]
};

console.log(math.add(7,5));
console.log(math.multiply(7,5));
console.log(math.sub(7,5));
console.log(math.numbers);