Data and charts · Ages 9–10

Rounding to tens and hundreds worksheet

Part of: Bigger bar charts and rounding

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Data and charts · Ages 9–10

Numsprite
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Write each answer in the space. For word problems, show your working and write a sentence answer.

1.487 rounded to the nearest ten is .
Answer:
2.114 rounded to the nearest hundred is .
Answer:
3.8454 rounded to the nearest hundred is .
Answer:
4.1597 lies between the hundreds and , and rounds to to the nearest hundred.
Fill in each blank
Answer:
5.1323 lies between the hundreds and , and rounds to to the nearest hundred.
Fill in each blank
Answer:
6.A whole number rounds to 430 to the nearest ten. What is the largest it can be?
Answer:

13.A computer costs $9,867. Rounded to the nearest ten, about how much is that?
Working:
Answer:
14.7218 people attend a concert. Rounded to the nearest hundred, about how many is that?
Working:
Answer:
15.Tsz-ching says a book has “about 400 pages”, rounding the pages to the nearest ten. What is the fewest pages it can have?
Working:
Answer:
16.A computer costs $6,389. Rounded to the nearest ten, about how much is that?
Working:
Answer:
17.3054 people attend a concert. Rounded to the nearest hundred, about how many is that?
Working:
Answer:
18.Ming says a book has “about 600 pages”, rounding the pages to the nearest ten. What is the fewest pages it can have?
Working:
Answer:

Show the answers and working

Rounding to tens and hundreds worksheet: Answers and working

1. 490
To round to the nearest ten, look at the ones digit of 487.
Look at the ones, 7: 0–4 round down, 5–9 round up: 490.
2. 100
To round to the nearest hundred, look only at the tens digit of 114.
Look at the tens, 1: 0–4 round down, 5–9 round up: 100.
3. 8500
To round to the nearest hundred, look only at the tens digit of 8454.
Look at the tens, 5: 0–4 round down, 5–9 round up: 8500.
4. 1500, 1600, 1600
Find the hundreds just below and just above 1597, then look at the tens.
1597 is between 1500 and 1600; the tens decide which is nearer: 1600.
5. 1300, 1400, 1300
Find the hundreds just below and just above 1323, then look at the tens.
1323 is between 1300 and 1400; the tens decide which is nearer: 1300.
6. 434
Which numbers round to 430? Think about which ones digits round down.
Only ones of 0–4 round down to 430; a 5 would round up. The largest is 434.

7. B. 1035
Rounding to the hundred depends on the tens. Think how far below or above 1000 a number can be and still round to it.
Numbers rounding to 1000 run from 50 below it to 49 above it: 1035.
8. False
Look at the ones digit of 427, round it to the ten yourself, then compare with 420.
Look at the ones: 427 rounds to 430.
9. C. 140
135 ends in 5, exactly half-way between two tens. Does that round down or up?
A 5 in the ones is exactly half-way, so round up: 140.
10. True
Look at the ones digit of 396, round it to the ten yourself, then compare with 400.
Look at the ones: 396 rounds to 400.
11. C. 820
815 ends in 5, exactly half-way between two tens. Does that round down or up?
A 5 in the ones is exactly half-way, so round up: 820.
12. B. 8778
Rounding to the hundred depends on the tens. Think how far below or above 8800 a number can be and still round to it.
Numbers rounding to 8800 run from 50 below it to 49 above it: 8778.

Marking: 2 for the working, 1 for the answer, 1 for the sentence.

13. 9,870 dollars
To the nearest ten, look at the ones digit of 9867.
The ones decide whether to round down or up: 9870.
14. 7200 people
To the nearest hundred, look at the tens digit of 7218.
The tens decide whether to round down or up: 7200.
15. 395 pages
For a number below 400, which ones digits round up to 400?
Below 400, only ones of 5 or more round up to it: the fewest is 395.
16. 6,390 dollars
To the nearest ten, look at the ones digit of 6389.
The ones decide whether to round down or up: 6390.
17. 3100 people
To the nearest hundred, look at the tens digit of 3054.
The tens decide whether to round down or up: 3100.
18. 595 pages
For a number below 600, which ones digits round up to 600?
Below 600, only ones of 5 or more round up to it: the fewest is 595.

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