The uploaded image contains estimation problems involving multiplication of two-digit numbers. Let me extract the key details and solve each problem using estimation.

Problems and Solutions:

1. 12. $78 \times 29$:

   • Round $78$ to $80$ and $29$ to $30$.
   • Estimated product: $80 \times 30 = 2400$.
   • Answer: $2400$.

2. 13. $56 \times 32$:

   • Round $56$ to $60$ and $32$ to $30$.
   • Estimated product: $60 \times 30 = 1800$.
   • Answer: $1800$.

3. 14. $83 \times 41$:

   • Round $83$ to $80$ and $41$ to $40$.
   • Estimated product: $80 \times 40 = 3200$.
   • Answer: $3200$.

Would you like detailed steps for each calculation or assistance with additional concepts?

Related Questions:

1. Why is estimation important in real-life calculations?
2. How do rounding rules affect the accuracy of your estimate?
3. Can we estimate by rounding one number up and the other down? Why or why not?
4. What are the benefits of using mental math for estimation in multiplication?
5. How can you improve your estimation skills in multiplication?

Tip: Always choose rounded numbers close to the original values to ensure a more accurate estimate.