Let’s consider how we can use variables and math operators to calculate new values and assign them to a variable. Check out the example below:

let w = 4; w = w + 1; console.log(w); // Output: 5

In the example above, we created the variable `w`

with the number `4`

assigned to it. The following line, `w = w + 1`

, increases the value of `w`

from `4`

to `5`

.

Another way we could have reassigned `w`

after performing some mathematical operation on it is to use built-in *mathematical assignment operators*. We could re-write the code above to be:

let w = 4; w += 1; console.log(w); // Output: 5

In the second example, we used the `+=`

assignment operator to reassign `w`

. We’re performing the mathematical operation of the first operator `+`

using the number to the right, then reassigning `w`

to the computed value.

We also have access to other mathematical assignment operators: `-=`

, `*=`

, and `/=`

which work in a similar fashion.

let x = 20; x -= 5; // Can be written as x = x - 5 console.log(x); // Output: 15 let y = 50; y *= 2; // Can be written as y = y * 2 console.log(y); // Output: 100 let z = 8; z /= 2; // Can be written as z = z / 2 console.log(z); // Output: 4

Let’s practice using these mathematical assignment operators!

### Instructions

**1.**

Use the `+=`

mathematical assignment operator to increase the value stored in `levelUp`

by `5`

.

**2.**

Use the `-=`

mathematical assignment operator to decrease the value stored in `powerLevel`

by `100`

.

**3.**

Use the `*=`

mathematical assignment operator to multiply the value stored in `multiplyMe`

by `11`

.

**4.**

Use the `/=`

mathematical assignment operator to divide the value stored in `quarterMe`

by `4`

.

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