https://file.aiquickdraw.com/mathbot/file/1729581724360dubxgwth.jpg

I can help solve the problems from the image you've uploaded. Let’s work through each set of questions:

### Question 90: **Ortiring (Estimation)**

1. \( 704 \ni 696 \ga \)
   \[
   704 - 696 = 8
   \]
   Result: 8

2. \( 667 \ni 6 \,096 \ga \)
   \[
   6\,096 - 667 = 5\,429
   \]
   Result: 5,429

3. \( 6\,867 \ni 1\,423 \ga \)
   \[
   6\,867 - 1\,423 = 5\,444
   \]
   Result: 5,444

4. \( 12\,835 \ni 7\,165 \ga \)
   \[
   12\,835 - 7\,165 = 5\,670
   \]
   Result: 5,670

---

### Question 91: **Addition and Check the Results**

1. \( 72\,905 + 54\,276 \)
   \[
   72\,905 + 54\,276 = 127\,181
   \]
   Result: 127,181

2. \( 67\,043 + 32\,957 \)
   \[
   67\,043 + 32\,957 = 100\,000
   \]
   Result: 100,000

3. \( 81\,228 + 39\,972 \)
   \[
   81\,228 + 39\,972 = 121\,200
   \]
   Result: 121,200

4. \( 76\,891 + 11\,984 \)
   \[
   76\,891 + 11\,984 = 88\,875
   \]
   Result: 88,875

---

### Question 92: **Addition and Check the Results**

1. \( 6\,938\,103 + 3\,646\,057 \)
   \[
   6\,938\,103 + 3\,646\,057 = 10\,584\,160
   \]
   Result: 10,584,160

2. \( 1\,774\,719 + 7\,853\,281 \)
   \[
   1\,774\,719 + 7\,853\,281 = 9\,628\,000
   \]
   Result: 9,628,000

3. \( 99\,740\,877 + 11\,067\,523 \)
   \[
   99\,740\,877 + 11\,067\,523 = 110\,808\,400
   \]
   Result: 110,808,400

4. \( 52\,181\,754 + 47\,919\,046 \)
   \[
   52\,181\,754 + 47\,919\,046 = 100\,100\,800
   \]
   Result: 100,100,800

---

Would you like more details or have any questions? Here are five related questions:

1. How would you check subtraction operations by reversing them?
2. What is the property of addition that allows for numbers to be added in any order?
3. Can subtraction be considered a commutative operation like addition?
4. How can you apply estimation techniques to speed up calculations in large additions?
5. What strategies can help avoid mistakes in large number arithmetic?

**Tip:** When adding large numbers, break them down into smaller parts (thousands, hundreds) to make the process easier to track.

Solve the subtraction and addition problems shown in the image, involving both smaller and larger numbers.

Work through subtraction and addition problems involving numbers up to millions. Practice key mathematical concepts, including estimation, basic subtraction, and large-number addition. Perfect for students in Grades 4-6.

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