216 / 3 = 72 mm while 8.5 / 3 = 2.8333 inches find that on your ruler.
It won't happen overnight for most of us, but try these exercises for a few weeks:
- Even when using standard U.S. paper sizes, think of them in their metric equivalencies such as 216 mm x 279 mm for "letter size" 8.5 x 11 (mm are approximate). Then, set your software to use millimeters for measurements. Try setting margins, gutters, and guidelines using millimeters instead of inches and fractions of inches. It's a first step to going metric.
- If you don't already have one, get a ruler that includes metric measurements (many standard 1 foot rulers have centimeters and millimeters on one side) and use the metric side to measure the dimensions of books on your bookshelf, junk mail, envelopes, the height of your desk, and even the length of your fingers and feet. Develop your own visual references for metric measures.
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