© 2012 Alston Publishing House Pte Ltd
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5 6 7 8 9
BM 2.1 Number cards
© 2012 Alston Publishing House Pte Ltd
1280
1198
1298
1270
1098
1297
1299
1298
1290
1300
1398
1300
BM 2.2 Choosing a number line
1301
1498
1310
1302
1598
1320
BM 2.3 Rules for rounding to
the nearest ten or hundred
Rule 1:
When I round a number to the nearest ten, I look at the digit in the ones
place.
(a) If the digit < 5, I round it to the smaller ten.
(b) If the digit > 5, I round it to the bigger ten.
(c) If the digit = 5, I round it to the bigger ten.
Rule 2:
When I round a number to the nearest hundred, I look at the digit in the
tens place.
(a) If the digit < 5, I round it to the smaller hundred.
(b) If the digit > 5, I round it to the bigger hundred.
(c) If the digit = 5, I round it to the bigger hundred.
© 2012 Alston Publishing House Pte Ltd
Name:
Date:
Class:
Worksheet 2.4 Rounding numbers
Round each number to the nearest ten, hundred or thousand as
indicated. For each question, state whether you can use the given
number line to round the number. If not, explain why the given number
line cannot be used. Then, in the box below each question, draw the
correct number line for rounding the number.
1. Round 3689 to the nearest hundred.
3589
3689
3789
3889
3989
4089
Can you use the number line given above to round 3689 to the
nearest hundred? Explain your answer.
Correct number line:
Answer: 3689 rounded to the nearest hundred is
.
© 2012 Alston Publishing House Pte Ltd
Name:
Date:
Class:
2. Round 4855 to the nearest thousand.
3000
4000
5000
6000
Can you use the number line given above to round 4855 to the
nearest thousand? Explain your answer.
Correct number line:
Answer: 4855 rounded to the nearest thousand is
© 2012 Alston Publishing House Pte Ltd
.
Name:
Date:
Class:
3. Round 9714 to the nearest thousand.
9700
9710
9720
9730
9740
9750
Can you use the number line given above to round 9714 to the
nearest thousand? Explain your answer.
Correct number line:
Answer: 9714 rounded to the nearest thousand is
.
© 2012 Alston Publishing House Pte Ltd