1. The problem is to multiply two-digit numbers by one-digit numbers. 2. The multiplication rule is: multiply each digit of the two-digit number by the one-digit number, starting from the units place, carry over if needed, and sum the results. 3. Let's solve the first problem: multiply 83 by 3. 4. Multiply units digit: $3 \times 3 = 9$. 5. Multiply tens digit: $8 \times 3 = 24$. 6. Combine results: $249$. 7. Therefore, $83 \times 3 = 249$. This method applies similarly to all other problems. Final answer for the first problem: $249$.