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Basic arithmetic often comes in handy when programming.

An operator is a character that performs a task in our code. JavaScript has several built-in arithmetic operators, that allow us to perform mathematical calculations on numbers. These include the following operators and their corresponding symbols:

1. Add: `+`
2. Subtract: `-`
3. Multiply: `*`
4. Divide: `/`
5. Remainder: `%`

The first four work how you might guess:

``````console.log(3 + 4); // Prints 7
console.log(5 - 1); // Prints 4
console.log(4 * 2); // Prints 8
console.log(9 / 3); // Prints 3``````

Note that when we `console.log()` the computer will evaluate the expression inside the parentheses and print that result to the console. If we wanted to print the characters `3 + 4`, we would wrap them in quotes and print them as a string.

``````console.log(11 % 3); // Prints 2
console.log(12 % 3); // Prints 0``````

The remainder operator, sometimes called modulo, returns the number that remains after the right-hand number divides into the left-hand number as many times as it evenly can: `11 % 3` equals 2 because 3 fits into 11 three times, leaving 2 as the remainder.

### Instructions

1.

Inside of a `console.log()`, add `3.5` to your age.

This is the age you’ll be when we start sending people to live on Mars.

2.

On a new line write another `console.log()`. Inside the parentheses, take the current year and subtract `1969`.

The answer is how many years it’s been since the 1969 moon landing.

3.

Create another `console.log()`. Inside the parentheses divide `65` by `240`.

4.

Create one last `console.log()`. Inside the parentheses, multiply `0.2708` by `100`.

That’s the percent of the sun that is made up of helium. Assuming we could stand on the sun, we’d all sound like chipmunks!