Numberphile revived an ancient multiplication trick—halves and doubles—also called Egyptian or Russian math, where you repeatedly halve one number and double the other. After crossing out rows with ...

When I moved from the East Coast to the Rocky Mountains years ago, I simply did not understand how to layer for warmth. I wore cotton long sleeve tees and was toasty when I stepped outside, but felt ...

In a classic winter layering system, it’s the midlayer that holds the magic. A good midlayer has to breathe, wick, and do most of the insulating for you, even when wet—a level of multitasking you ...

Susan Bard, MD, is a board-certified general and procedural dermatologist with the American Board of Dermatology and a Fellow of the American College of Mohs Surgery. Cleansing, moisturizing, and ...

convert the numbers from standard form into decimal form or ordinary numbers complete the calculation convert the answer back into standard form Calculate \((4 \times 10^9) \times (7 \times 10^{-3})\) ...

When multiplying fractions, multiply the top numbers (numerators) together and multiply the bottom numbers (denominators) together, then simplify or it is sometimes easier simplify first.