Let’s solve the problems step by step.

Addition Problems:

1. 8,720 + 4,500 = 13,220
2. 3,124 + 1,234 = 4,358
3. 7,067 + 5,640 = 12,707
4. 3,605 + 1,008 = 4,613

Subtraction Problems:

1. 7,774 − 2,496 = 5,278
2. 5,138 − 2,452 = 2,686
3. 5,316 − 3,400 = 1,916
4. 8,679 − 2,111 = 6,568

Multiplication Problems:

1. 65 × 6 = 390
2. 88 × 5 = 440
3. 662 × 2 = 1,324
4. 44 × 97 = 4,268

Division Problems:

1. 144 ÷ 2 = 72
2. 3,567 ÷ 8 = 445.875 (or 445 remainder 7)

Let me know if you need detailed steps for any of these!

Follow-Up Questions:

1. Can you explain how to perform subtraction with borrowing in problem 2 of subtraction?
2. How can you estimate the product of 44 × 97 before multiplying?
3. What is the remainder when dividing 3,567 by 8?
4. How do you simplify division problems like 144 ÷ 2 mentally?
5. What’s the best way to add large numbers like 8,720 and 4,500 without a calculator?

Tip:

When solving large multiplication problems like 44 × 97, break them into smaller parts:
$44 × 97 = 44 × (100 - 3) = 44 × 100 - 44 × 3 = 4,400 - 132 = 4,268.$
This method reduces errors!