(4)

To solve , you first need a common denominator. The least common multiple of 4 and 10 is 20. Convert each fraction: becomes and becomes . Now perform the subtraction: . So, .

Want to impress your friends with some math trivia? The technique of finding a common denominator has a long history, dating back to ancient Babylonians who had clever ways to work with fractions, proving that even thousands of years ago, math was a universal language!

When dealing with fractions, a common mistake is forgetting to adjust both the numerators after finding the common denominator. Always check your work—it’s easy to skip steps when you’re rushing. Taking your time ensures accuracy and boosts your confidence for those tricky math tests!