1. The problem is to understand and perform reduction for multiplication (muls). 2. Reduction in multiplication often means simplifying the product by canceling common factors or using properties of multiplication. 3. For example, if you have a product like $\frac{a}{b} \times \frac{c}{d}$, you can multiply numerators and denominators: $$\frac{a \times c}{b \times d}$$ 4. If there are common factors in numerator and denominator, you can cancel them using the rule: $$\frac{\cancel{a} \times c}{\cancel{a} \times d} = \frac{c}{d}$$ 5. This process reduces the multiplication to a simpler form. 6. Another example: multiply $6 \times 15$. Factorize: $6 = 2 \times 3$, $15 = 3 \times 5$. 7. Multiply: $6 \times 15 = (2 \times 3) \times (3 \times 5) = 2 \times \cancel{3} \times \cancel{3} \times 5$ (if dividing by 3 somewhere else). 8. Without division, just multiply: $6 \times 15 = 90$. 9. So reduction helps simplify multiplication especially with fractions or algebraic expressions. 10. In summary, use factorization and cancel common factors to reduce multiplication expressions.