Printable primary math worksheet for math grades 1 to 6 based on ... - Free Printable

Problem Analysis:

The task involves two main parts:
1. Rounding numbers to the underlined digit: For each number, identify the underlined digit and round the number to that specific place value.
2. Identifying the rounded digits: For a given number and its rounded form, underline the digit to which the number was rounded.

Let's solve each part step by step.

---

Part 1: Rounding Numbers to the Underlined Digit

#### Instructions:
- Identify the underlined digit in each number.
- Round the number to that specific place value.
- If the digit immediately to the right of the underlined digit is 5 or greater, round up. Otherwise, round down.

#### Solutions:

1. 2,190,538 (Underlined digit: 9)
- Place value: Thousands
- Digit to the right of 9 is 0 (less than 5).
- Rounded: 2,190,000

2. 1,668,711 (Underlined digit: 6)
- Place value: Hundred thousands
- Digit to the right of 6 is 6 (greater than or equal to 5).
- Rounded: 1,700,000

3. 172,650 (Underlined digit: 7)
- Place value: Thousands
- Digit to the right of 7 is 2 (less than 5).
- Rounded: 170,000

4. 2,095,199 (Underlined digit: 9)
- Place value: Ten thousands
- Digit to the right of 9 is 5 (equal to 5).
- Rounded: 2,100,000

5. 6,335,638 (Underlined digit: 3)
- Place value: Millions
- Digit to the right of 3 is 3 (less than 5).
- Rounded: 6,000,000

6. 8,124,126 (Underlined digit: 1)
- Place value: Hundred millions
- Digit to the right of 1 is 2 (less than 5).
- Rounded: 8,000,000

7. 3,769,300 (Underlined digit: 7)
- Place value: Hundred thousands
- Digit to the right of 7 is 6 (greater than or equal to 5).
- Rounded: 3,800,000

8. 3,564,490 (Underlined digit: 6)
- Place value: Hundred thousands
- Digit to the right of 6 is 4 (less than 5).
- Rounded: 3,600,000

9. 2,321,350 (Underlined digit: 2)
- Place value: Millions
- Digit to the right of 2 is 2 (less than 5).
- Rounded: 2,000,000

10. 912,809 (Underlined digit: 1)
- Place value: Hundred thousands
- Digit to the right of 1 is 2 (less than 5).
- Rounded: 900,000

11. 5,287,224 (Underlined digit: 8)
- Place value: Hundred thousands
- Digit to the right of 8 is 7 (greater than or equal to 5).
- Rounded: 5,300,000

12. 233,290 (Underlined digit: 3)
- Place value: Ten thousands
- Digit to the right of 3 is 3 (less than 5).
- Rounded: 230,000

13. 1,150,175 (Underlined digit: 1)
- Place value: Hundred thousands
- Digit to the right of 1 is 5 (equal to 5).
- Rounded: 1,200,000

14. 2,515,110 (Underlined digit: 5)
- Place value: Millions
- Digit to the right of 5 is 1 (less than 5).
- Rounded: 2,500,000

---

Part 2: Underlining the Digits to Which the Numbers Are Rounded Off

#### Instructions:
- For each pair of numbers (original and rounded), identify the digit in the original number that corresponds to the place value of the rounded number.
- Underline that digit.

#### Solutions:

1. 2,323,059 → 2,000,000
- Rounded to the millions place.
- Underlined digit: 2

2. 3,658,235 → 3,660,000
- Rounded to the ten thousands place.
- Underlined digit: 6

3. 145,113 → 150,000
- Rounded to the ten thousands place.
- Underlined digit: 4

4. 534,808 → 500,000
- Rounded to the hundred thousands place.
- Underlined digit: 5

5. 1,009,387 → 1,009,390
- Rounded to the tens place.
- Underlined digit: 9

6. 2,552,330 → 2,552,000
- Rounded to the thousands place.
- Underlined digit: 2

7. 1,146,134 → 1,100,000
- Rounded to the hundred thousands place.
- Underlined digit: 1

8. 1,244,188 → 1,000,000
- Rounded to the millions place.
- Underlined digit: 1

9. 589,411 → 590,000
- Rounded to the ten thousands place.
- Underlined digit: 8

10. 4,156,130 → 4,156,100
- Rounded to the hundreds place.
- Underlined digit: 6

11. 1,044,918 → 1,044,900
- Rounded to the tens place.
- Underlined digit: 9

12. 592,276 → 600,000
- Rounded to the hundred thousands place.
- Underlined digit: 5

13. 3,557,614 → 3,000,000
- Rounded to the millions place.
- Underlined digit: 3

14. 6,112,423 → 6,100,000
- Rounded to the hundred thousands place.
- Underlined digit: 1

---

Final Answer:

#### Part 1: Rounded Numbers
1. 2,190,000
2. 1,700,000
3. 170,000
4. 2,100,000
5. 6,000,000
6. 8,000,000
7. 3,800,000
8. 3,600,000
9. 2,000,000
10. 900,000
11. 5,300,000
12. 230,000
13. 1,200,000
14. 2,500,000

#### Part 2: Underlined Digits
1. 2
2. 6
3. 4
4. 5
5. 9
6. 2
7. 1
8. 1
9. 8
10. 6
11. 9
12. 5
13. 3
14. 1

Final Boxed Answer:
\[
\boxed{
\begin{array}{ll}
\text{Part 1:} & \text{2,190,000, 1,700,000, 170,000, 2,100,000, 6,000,000, 8,000,000, 3,800,000, 3,600,000, 2,000,000, 900,000, 5,300,000, 230,000, 1,200,000, 2,500,000} \\
\text{Part 2:} & \text{2, 6, 4, 5, 9, 2, 1, 1, 8, 6, 9, 5, 3, 1}
\end{array}
}
\]