Add, subtract, multiply, divide, simplify. Any fraction, done.

AskSia finds the least common denominator (LCD) of all the fractions first. The LCD is the LCM of the denominators. Then AskSia rewrites each fraction with the LCD by multiplying numerator and denominator by the same factor. Once all fractions have the same denominator, AskSia adds the numerators (keeping the common denominator), then simplifies the result to lowest terms by dividing by the GCF. For example, 1/3 + 1/4: LCD is 12, so 1/3 = 4/12 and 1/4 = 3/12, sum is 7/12 (already in lowest terms).

AskSia uses the 'multiply by the reciprocal' rule: dividing by a fraction is the same as multiplying by its reciprocal (numerator and denominator swapped). For example, (2/3) ÷ (4/5) becomes (2/3) × (5/4). Then AskSia applies the multiplication rule (multiply numerators, multiply denominators), canceling common factors when possible to keep numbers small. So (2 × 5)/(3 × 4) = 10/12, which reduces to 5/6. The reciprocal step is shown explicitly so the method is clear.

AskSia finds the greatest common factor (GCF) of the numerator and denominator, then divides both by the GCF. For 24/36: GCF(24, 36) = 12, so 24/36 = 2/3. AskSia shows the GCF calculation (often via prime factorization: 24 = 2³ × 3, 36 = 2² × 3², so GCF = 2² × 3 = 12) and the division step. The final fraction has numerator and denominator with no common factor other than 1, which is the definition of lowest terms.

Yes. Algebraic fractions like (x + 3)/(x² minus 9) are handled with the same operations as numeric fractions, but with extra care. To simplify, AskSia factors both numerator and denominator and cancels common factors: (x + 3)/(x² minus 9) = (x + 3)/((x + 3)(x minus 3)) = 1/(x minus 3), with the restriction x ≠ -3 (where the original was undefined). For add/subtract, AskSia finds the LCD of the polynomial denominators (using factored forms), rewrites each fraction, combines, and simplifies. Multiplication and division follow the same straight-across or reciprocal rules.

AskSia hits 98% accuracy on standard high school and college coursework, measurably higher than ChatGPT, Photomath, and Symbolab on the same problem sets. Accuracy comes from subject-specialized models, a symbolic verification pass that catches arithmetic errors, and a self-check step that re-derives the answer before showing it to you.

Yes. After any solve, ask Sia to generate similar practice problems at SAT, ACT, AP, IB, or college difficulty, or build a flashcard set on the underlying concept in one tap. Useful for exam prep and spaced repetition before a quiz, midterm, or final.

AskSia has a free plan that includes daily solves across all subjects. AskSia Pro and Super include unlimited solves, advanced subjects, the full AI tutor companion, exports, and priority response speed. See pricing for details.