Rounding numbers up to billions worksheet with 20 exercises.

Let’s go through each problem one by one. The task is to round the underlined digit — meaning we look at the digit that’s underlined, and round the number to that place value.

We’ll use standard rounding rules:
- If the digit to the right of the underlined digit is 5 or more, round up.
- If it’s less than 5, round down (keep the underlined digit the same).
- Then replace all digits to the right with zeros.

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1. 8,858,811,139 → underline is on the 5 (hundred millions place)
→ Look at next digit: 8 (ten millions) → 8 ≥ 5 → round up
→ 8,800,000,000 becomes 8,900,000,000? Wait — let’s check place values.

Actually, let’s write the number with place labels:

8,858,811,139
Billions: 8
Hundred Millions: 8
Ten Millions: 5 ← underlined
Millions: 8
...

Wait — looking again:
The number is 8,858,811,139
Underlined digit is the 5 in the ten millions place? Let’s count from right:

Positions (from right):
Units, Tens, Hundreds, Thousands, Ten Thousands, Hundred Thousands, Millions, Ten Millions, Hundred Millions, Billions...

So:
8,858,811,139
Breakdown:
- 8 (billions)
- 8 (hundred millions)
- 5 (ten millions) ← underlined
- 8 (millions)
- 8 (hundred thousands)
- 1 (ten thousands)
- 1 (thousands)
- 1 (hundreds)
- 3 (tens)
- 9 (units)

So we are rounding to the ten millions place.

Digit to the right (millions place) is 8 → ≥5 → round up the ten millions digit (5 → 6)

So: 8,860,000,000

But wait — original number is 8,858,811,139 → if we round to ten millions, we keep up to ten millions and zero out the rest.

After rounding: 8,860,000,000

✔ Correct.

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2. 7,427,917,453 → underline on 4 (hundred millions place)

Number: 7,427,917,453
Breakdown:
- 7 (billions)
- 4 (hundred millions) ← underlined
- 2 (ten millions) ← this is the next digit

Next digit is 2 → <5 → round down → keep 4

So: 7,400,000,000

✔

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3. 1,625,132,635 → underline on 1 (billions place)

Only one digit before comma? Actually: 1,625,132,635 → 1 billion, 625 million...

Underlined digit is the 1 in the billions place.

Next digit (hundred millions) is 6 → ≥5 → round up → 1 → 2

So: 2,000,000,000

✔

---

4. 3,684,874,167 → underline on 3 (billions place)

Next digit: 6 → ≥5 → round up → 3 → 4

So: 4,000,000,000

✔

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5. 1,045,294,811 → underline on 5 (ten thousands place? Let’s check)

Number: 1,045,294,811

Breakdown:
- 1 (billions)
- 0 (hundred millions)
- 4 (ten millions)
- 5 (millions) ← wait, is 5 underlined?

Looking back at image: “1,045,294,811” — the 5 is underlined.

In 1,045,294,811 — positions:

From left:
1 (billions), 0 (hundred millions), 4 (ten millions), 5 (millions) ← yes, 5 is in millions place.

Next digit: 2 (hundred thousands) → <5 → round down → keep 5

So: 1,045,000,000

✔

---

6. 4,495,385,445 → underline on 5 (millions place)

Number: 4,495,385,445
Underlined: 5 in millions place
Next digit: 3 (hundred thousands) → <5 → round down → keep 5

So: 4,495,000,000

✔

---

7. 5,156,802,937 → underline on 6 (ten thousands? Let’s see)

Number: 5,156,802,937
Breakdown:
5 (billions), 1 (hundred millions), 5 (ten millions), 6 (millions) ← underlined?
Wait — in “5,156,802,937”, the 6 is in the millions place? Let’s count:

From right:
...937 (last three)
802 (next three) → thousands group
156 → millions group → so 6 is in millions place? No:

Standard grouping:
5,156,802,937
→ 5 (billions)
→ 156 (millions) → so 1=hundred millions, 5=ten millions, 6=millions ← underlined

Next digit: 8 (hundred thousands) → ≥5 → round up → 6 → 7

So: 5,157,000,000

✔

---

8. 1,809,533,490 → underline on 1 (billions place)

Next digit: 8 → ≥5 → round up → 1 → 2

So: 2,000,000,000

✔

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9. 4,498,368,783 → underline on 3 (hundred thousands? Let’s check)

Number: 4,498,368,783
Groups:
4 (billions)
498 (millions)
368 (thousands)
783 (units)

Underlined digit is 3 — which is in the hundred thousands place? In 368,783 — 3 is hundred thousands.

Next digit: 6 (ten thousands) → ≥5 → round up → 3 → 4

So: 4,498,400,000

Wait — but we’re rounding to hundred thousands, so we keep up to hundred thousands and zero out the rest.

Original: 4,498,368,783
Round to hundred thousands: look at ten thousands digit (6) → round up → 368,783 → 400,000

So total: 4,498,400,000

✔

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10. 5,045,446,403 → underline on 0 (hundred millions place)

Number: 5,045,446,403
Breakdown:
5 (billions)
0 (hundred millions) ← underlined
4 (ten millions) ← next digit

4 < 5 → round down → keep 0

So: 5,000,000,000

✔

---

11. 6,137,898,650 → underline on 6 (billions place)

Next digit: 1 → <5 → round down → keep 6

So: 6,000,000,000

✔

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12. 2,620,226,730 → underline on 6 (hundred millions place)

Number: 2,620,226,730
2 (billions), 6 (hundred millions) ← underlined
Next digit: 2 (ten millions) → <5 → round down → keep 6

So: 2,600,000,000

✔

---

13. 2,294,524,064 → underline on 4 (ten thousands? Let’s check)

Number: 2,294,524,064
Groups:
2 (billions)
294 (millions)
524 (thousands)
064 (units)

Underlined digit is 4 — in 524,064 → 4 is in thousands place? Wait:

524,064 → 5=hundred thousands, 2=ten thousands, 4=thousands ← underlined

Next digit: 0 (hundreds) → <5 → round down → keep 4

So: 2,294,524,000

✔

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14. 4,662,454,710 → underline on 6 (ten millions place)

Number: 4,662,454,710
Breakdown:
4 (billions)
6 (hundred millions)
6 (ten millions) ← underlined
2 (millions) ← next digit

2 < 5 → round down → keep 6

So: 4,660,000,000

✔

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15. 1,127,409,873 → underline on 7 (ten thousands? Let’s check)

Number: 1,127,409,873
Groups:
1 (billions)
127 (millions)
409 (thousands)
873 (units)

Underlined digit is 7 — in 127,409,873 → 7 is in millions place? Wait:

127 million → 1=hundred millions, 2=ten millions, 7=millions ← underlined

Next digit: 4 (hundred thousands) → <5 → round down → keep 7

So: 1,127,000,000

✔

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16. 5,165,291,038 → underline on 5 (billions place)

Next digit: 1 → <5 → round down → keep 5

So: 5,000,000,000

✔

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17. 4,310,902,024 → underline on 0 (ten thousands? Let’s check)

Number: 4,310,902,024
Groups:
4 (billions)
310 (millions)
902 (thousands)
024 (units)

Underlined digit is 0 — in 902,024 → 0 is in hundred thousands? Wait:

902,024 → 9=hundred thousands, 0=ten thousands, 2=thousands ← underlined

Next digit: 2 (thousands) → <5 → round down → keep 0

So: 4,310,900,000

Wait — rounding to ten thousands: we keep up to ten thousands, zero out hundreds, tens, units.

Original: 4,310,902,024
After rounding to ten thousands: 4,310,900,000

✔

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18. 7,725,544,774 → underline on 5 (hundred thousands? Let’s check)

Number: 7,725,544,774
Groups:
7 (billions)
725 (millions)
544 (thousands)
774 (units)

Underlined digit is 5 — in 544,774 → 5 is in hundred thousands place? Wait:

544,774 → 5=hundred thousands, 4=ten thousands, 4=thousands ← underlined

Next digit: 4 (ten thousands) → <5 → round down → keep 5

So: 7,725,500,000

✔

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19. 9,329,978,400 → underline on 9 (billions place)

Next digit: 3 → <5 → round down → keep 9

So: 9,000,000,000

✔

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20. 249,955,162 → underline on 5 (ten thousands? Let’s check)

Number: 249,955,162
Breakdown:
249 (millions)
955 (thousands)
162 (units)

Underlined digit is 5 — in 955,162 → 5 is in thousands place? Wait:

955,162 → 9=hundred thousands, 5=ten thousands, 5=thousands ← underlined

Next digit: 1 (hundreds) → <5 → round down → keep 5

So: 249,955,000

Wait — rounding to thousands: we keep up to thousands, zero out hundreds, tens, units.

Original: 249,955,162 → after rounding to thousands: 249,955,000

✔

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Now, compiling all answers:

1. 8,860,000,000
2. 7,400,000,000
3. 2,000,000,000
4. 4,000,000,000
5. 1,045,000,000
6. 4,495,000,000
7. 5,157,000,000
8. 2,000,000,000
9. 4,498,400,000
10. 5,000,000,000
11. 6,000,000,000
12. 2,600,000,000
13. 2,294,524,000
14. 4,660,000,000
15. 1,127,000,000
16. 5,000,000,000
17. 4,310,900,000
18. 7,725,500,000
19. 9,000,000,000
20. 249,955,000

Final Answer:
1. 8,860,000,000
2. 7,400,000,000
3. 2,000,000,000
4. 4,000,000,000
5. 1,045,000,000
6. 4,495,000,000
7. 5,157,000,000
8. 2,000,000,000
9. 4,498,400,000
10. 5,000,000,000
11. 6,000,000,000
12. 2,600,000,000
13. 2,294,524,000
14. 4,660,000,000
15. 1,127,000,000
16. 5,000,000,000
17. 4,310,900,000
18. 7,725,500,000
19. 9,000,000,000
20. 249,955,000