## Learn creative coding writing simple programs

### 33. Use multiplication to scale up or down speeds and sizes

Multiplication is something we often use in our programs, so it's important to feel comfortable with it. In programming languages, the sign used for multiplication is the asterisk: *. When we multiply any number by 1, we get the same number: 77 * 1 = 77. When we multiply by a number larger than 1, we get a number larger than the original number: 77 * 1.2 = 92.4. When we multiply by a positive number smaller than 1, we make it smaller: 77 * 0.8 = 61.6. Knowing these simple rules we create a program where objects move a different speeds. We also update the program we created with 5 rotating rectangles to give each rectangle a different rotation speed.

### Code editor

You can make changes to the code below. Then

**Reference**

background

draw

ellipse

fill

float

noStroke

rect

rectMode

resetMatrix

rotate

setup

size

translate

void

Try to stay close to the topic of this episode. Use the Processing forums for help with unrelated Processing projects (or hire me for help ;-)

To indicate that a word in your comment is code, use the `backtick`. Example

`Do `float` and `int` smell similar?`

To highlight code blocks, use ```processing and ``` like this:````processing`

void setup() {

size(600, 600);

}

```