Rounding Numbers Past a Hundred Thousand

Mathematics · Number Representation & Place Value · ages 9-10

Name ______________________ Date ____________

Round 4,567 to the nearest hundred.
- 4,600
- 4,500
- 4,000
- 5,000
Round 456,782 to the nearest 10,000.
Answer: ______________
Round 452,900 to the nearest 1,000. Which digit do you check to decide?
- Hundreds digit
- Thousands digit
- Ten-thousands digit
When the digit you check is exactly 5, you always round up.
Circle one: True False
Estimate 387,412 + 214,560 by rounding each number to the nearest 100,000.
Answer: ______________
Estimate 387,412 + 214,560 by rounding each number to the nearest 10,000 first. Which is the best estimate?
- 500,000
- 600,000
- 700,000
Round 950,500 to the nearest 100,000.
- 1,000,000
- 900,000
- 950,000
- 100,000
Estimate 62,345 + 38,901 by rounding each to the nearest 10,000.
- 100,000
- 90,000
- 101,246
- 110,000
Ben rounded 950,500 to the nearest 100,000 and wrote 900,000. What did he get wrong?
- He rounded correctly
- He should have rounded to 950,000
- He checked the wrong digit and should have rounded up to 1,000,000
A stadium holds 895,317 seats. Round this number to the nearest 10,000 to put on a sign. Type the rounded number.
Answer: ______________

Answer key

For grown-ups. Fold this page away before handing over the rest.

4,600 · The tens digit is 6, which rounds the 5 up: 4,600.
460000 · The thousands digit is 6, which rounds the 5 up: 460,000.
Hundreds digit · To round to the nearest 1,000, look at the digit right after it, the hundreds digit. It's 9, so you round up.
True · That's the rule for a 5: round up, even if it feels like the exact middle.
600000 · 387,412 rounds to 400,000 and 214,560 rounds to 200,000: 600,000.
600,000 · 387,412 rounds to 390,000 and 214,560 rounds to 210,000. 390,000 + 210,000 = 600,000.
1,000,000 · The ten-thousands digit is 5, which pushes 9 up past the boundary to 1,000,000.
100,000 · 62,345 rounds to 60,000 and 38,901 rounds to 40,000: 100,000.
He checked the wrong digit and should have rounded up to 1,000,000 · The ten-thousands digit is 5, so 950,500 rounds up to 1,000,000, not down to 900,000.
900000 · The thousands digit is 5, so the ten-thousands digit rounds up from 9 to 10, making it 900,000.