1. **Problem 1: Multiply 300 by 0.84** Step 1: State the problem. Multiply $300 \times 0.84$. Step 2: Use the multiplication formula. Multiplication is repeated addition. Here, we multiply a whole number by a decimal. Step 3: Multiply ignoring the decimal. $300 \times 84 = 25200$ Step 4: Adjust for the decimal point. Since 0.84 has two decimal places, divide the product by $10^2 = 100$: $$\frac{25200}{100} = 252.00$$ Step 5: Final answer. $300 \times 0.84 = 252.00$ 2. **Problem 2: Multiply 3167 by 0.50** Step 1: State the problem. Multiply $3167 \times 0.50$. Step 2: Multiply ignoring the decimal. $3167 \times 50 = 158350$ Step 3: Adjust for the decimal point. Since 0.50 has two decimal places, divide by $10^2 = 100$: $$\frac{158350}{100} = 1583.50$$ Step 4: Final answer. $3167 \times 0.50 = 1583.50$ 3. **Problem 3: Multiply 500 by 30** Step 1: State the problem. Multiply $500 \times 30$. Step 2: Multiply directly. $500 \times 30 = 15000$ Step 3: Final answer. $500 \times 30 = 15000$