Open your word-processing program to a postcard template. The blank postcards are a nicer, heavier quality paper that will take some wear and tear from you and your student. If your word-processing software doesn't have a template, you can download one from the postcard manufacturer's website.
Type in your information. Whether you are doing multiplication tables or words, insert your text on each of the six areas of your postcard template.
Highlight your text and change the font to a larger size to make them more easily readable. A font such as Arial or Comic Sans works nicely for flash cards, as they are a bit thicker lined.
Add graphics to word flash cards to help with foreign language studies or vocabulary building. Simply go to Insert, Clip Art and select an appropriate design. Resize as necessary.
Print off cards on postcard stock and fold and separate at perforations. Write word definitions and math solutions on the back of the cards so your student can study alone.
Cut up some old manila folders or posterboard into 4x6 rectangles. You need stiff paper stock for your flashcards so that they can stand up to daily usage.
Write out the math or word problems you want to study on the cards in large, bold, clear handwriting with a black magic marker. Make sure words are spelled correctly and numbers are identifiable.
Write the word definition or math problem solution on the back of the flash card, being sure that the marker is not bleeding through your posterboard.
Add some stickers on some cards to keep them visually interesting to your child. If you are artsy, draw some related items on your word flashcards to help your child associate his or her new words.