Have a list of the Presidents' names in front of you. Turn each name into an image that you can associate with the name. For example, with James Monroe, imagine "money in a row." Next to each name, write down the image. Picture the images in your mind as you go through the list several times.
Another way to use these same images and continue in the memorization process is to turn these images into a story. This will also help you remember the Presidents in chronological order. A part of the story can go something like, "The picture 'Jack drew' (Andrew Jackson) was found in a 'martian van' (Martin Van Buren)." Read the story to yourself and visualize the images, associating them with each of the Presidents.
Imagine your house. Think of multiple items in each of the rooms. If you have nine rooms, choose four or five objects in each room to represent the Presidents. Pick objects that you can associate with a President or morph them into objects that will remind you of them. For example, a toilet can represent Andrew Johnson because toilets are often nicknamed "the John." Imagine a top hat and a beard on a piece of furniture to help remind you of Abraham Lincoln.
This is a simple way to learn the Presidents in order. List the numbers "1" through "44" on a piece of paper. Next to each number, place a picture that you would associate with the number: Think of old nursery rhymes, rhyme a noun with a number, or make up your own object that you can easily associate with the number. Take the technique from the first tip and use all the images you associated with the Presidents. Put these in a sentence, starting with the first President and continuing to the last. For example, use the image of Adam from the Bible and put a shoe on him ("shoe" rhymes with "two" and Adams was the second President).