Round \( 8.91 \) to the nearest tenth.

To round \( 8.91 \) to the nearest tenth, you look at the digit in the hundredths place, which is \( 1 \). Since \( 1 \) is less than \( 5 \), you keep the tenths digit, \( 9 \), the same. Therefore, \( 8.91 \) rounded to the nearest tenth is \( 8.9 \). For a fun fact, rounding is like making useful estimates! It's commonly used in finance to make calculations cleaner, like simplifying your shopping budget. Instead of \( \$8.91 \), you might just think of it as \( \$8.90 \), making mental math a lot easier. In everyday life, rounding helps in situations where precise numbers aren't necessary, like cooking measurements or figuring out time. If the recipe calls for \( 2.7 \) cups of flour, you can round up to \( 3 \) cups, keeping it simple and still delicious!