Multiply 20 9 7Dffc2

1. **State the problem:** Calculate the product of $20$ and $9$. 2. **Formula used:** Multiplication of two numbers $a$ and $b$ is given by $$a \times b$$. 3. **Apply the formula:** Here, $a = 20$ and $b = 9$, so we calculate $$20 \times 9$$. 4. **Intermediate work:** $$20 \times 9 = 180$$. 5. **Explanation:** Multiplying $20$ by $9$ means adding $20$ nine times or $9$ twenty times, which results in $180$. 6. **Final answer:** $$180$$.