🎓 Deeper Dive — Adults

A fraction p/q where q ≠ 0 represents the rational number "p divided by q".

Common denominator: to add 2/3 + 1/4, find LCM(3,4)=12 → 8/12 + 3/12 = 11/12. Multiplication: straightforward — multiply tops and bottoms. Division: "invert and multiply" because a/b ÷ c/d = a/b × d/c.

Decimals and percents: all three are interchangeable. 0.25 = 1/4 = 25%.