1. The problem is to multiply single-digit numbers as shown in the grid. 2. The multiplication rule is: multiply the two numbers to get the product. 3. We will solve the first multiplication problem: $5 \times 0$. 4. Multiply $5$ by $0$: $$5 \times 0 = 0$$ 5. The product is $0$ because any number multiplied by zero equals zero. Final answer: $0$