So what's the big idea anyway?

25 practice problems—find out what you can do.

Learn dimensional analysis by working through the answers.

Copy and make your own cheat-sheet.

Know'm and love'm.

Be afraid, be very afraid.

You could save a life.

Or how I came to post so much stuff on this Web site.

The one-page all-you-really-need-to-know guide.

A unified approach, 4th ed.

Some general examples here.

Drug calculation quiz I took to get my first job.

Palm files and programs you can use.

When you're doing applied math numbers have units of measure, or "dimensions," attached to them. There are lots of formulas out there, but here's the big idea: when you plug values into a formula and pay close attention to what happens to the units as the formula is simplified, you'll see that all the units cancel out except those units that end up in your answer. This always happens if the formula is correct and you plug in the appropriate factors.

So what someone figured out is that you don't need formulas at all. For every problem you can just take the factors associated with it and arrange them so all the units you don't want cancel out. You're then left with only the units you do want (the ones in your answer). This process is fairly trivial, and with only slight attention to detail, you always get the right answer, bing-bang-boom, every time.

The technique has been taught to students of applied science for longer than I have been able to determine and for the sole reason that students using it make fewer mistakes. You pay attention to the units of measure and if they're not canceling out right, you know that you're doing something wrong and that your answer is guaranteed to be wrong.

As nurses doing calculations, error is not an option. Passing med-math class may require getting only 80% of test problems right, but coming up with the right answer only four out of five times isn't good enough when real patients are at risk. While mistakes can still be made using any technique, dimensional analysis does the best job of minimizing them. The only fault lies in the name. Perhaps the Math-Weenie-No-Brainer technique would be more appropriate. At any rate, give dimensional analysis a try. At the end of a 12-hour shift, when you're tired, things are crazy, and you have to do a med-math calculation, you'll be glad you did.

Eric Lee, RN

Haven't read this, but there is a book now. If the publisher were to send me a copy, I'd be willing to review it (hint, hint).

Support this site: Visit our Zazzle store featuring ultra hi-res images of artworks, Hubble/ESA/NASA space images, Mandelbrot fractals, maps and more. Images up to 525 megapixels allow for fine printing at the largest sizes. Give a fine print as a gift that could hang around for a hundred years.

### Other sites by Alysion

- World's Funniest Jokes
- Survival Retreat? Maybe now is the time
- For wisdom: follow The Path of the Dog
- Beginnings: First Lines from Scriptures
- World Religion Simplified
- The Diamond Sutra: Condensed version
- The Platform Sutra of Huineng: Condensed
- The Tibetan Book of the Great Liberation
- The Zen Teachings of Huang Po on the One Mind
- Zen and the Art of Mindful Bus Riding
- Private Retreat: Alysion Acres
- Two Zen Stories
- 14 Mindfulness Trainings of Thich Nhat Hanh
- 14 Thoughtfulness Trainings
- Westfulness and Eastfulness
- Mindfulness Meditation Bell, Gong, Timer
- Buyer's Guide to Food Preparedness Products
- One Homestead: An intentional community
- Poems to Memorize & Memorable Poems
- Mom's Favorite Poems
- Ryan's Favorite Poems
- WWW Collection of Favorite String Figures
- Take the Super Post-Mensa IQ Test
- Alternative Handwriting and Shorthand Systems
- Handywrite
- Handywrite Shorthand
- Making the Tree of Life: Fun with Phylogenetics
- Human Chow: The Website
- Small Animal Euthanasia at Home
- Fun with Dimensional Analysis
- Walled-in: A poem
- Making Boxes for your Rock & Mineral Collection
- Making a Mass Balance Scale
- Ryan's 50 States Flashcards
- Adventures of MeraLee
- World Religions Simplified
- eBike Touring Association
- The True Right to Life Movement
- Cochise Stronghold Trail

### External Links

- Fun with Dimensional Analysis
- General examples.

- Math Skills Review
- For chemistry students.

### Top 10 Poems from Alysion's

### Bucket List of Poems

to Read Before You Die

- 1. The Rainy Day by Henry W. Longfellow
- 2. Fire and Ice by Robert Frost
- 3. A Dream within a Dream by Edgar Allan Poe
- 4. The Purple Cow by Gelett Burgess
- 5. If by Rudyard Kipling
- 6. To See a World by William Blake
- 7. Ten Little Limericks
- 8. First Fig by Edna St. Vincent Millay
- 9. Alone by Edgar Allan Poe
- 10. I'm nobody! Who are you? Emily Dickinson

One of many How-to videos on YouTube.