1. Count on in 6s.
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4000
4006
4012
4018
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2. Count on in 60s.
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4000
4060
4120
4180
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3. Count on in 600s
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4000
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5200
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5800
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7600
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5820
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5812
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4. Count back in 8s
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5836
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5828
5. Count back in _______.
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50 836
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50 756
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50 676
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50 516
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What do you notice about the digits in the numbers in b?
Complete the following.
a. 4 096 is __________ less than 4 496.
b. 5 369 is __________ less than 5 069.
c. 10 365 is 2 000 more than __________.
d. 8 422 is 1 000 more than _________.
e. Eleven thousand two hundred five is 5 more than ___________________
_______________________________________________.
f. 18 478 is __________ more than 18 178.
g. ________ less than 23 849 is 23 809.
Compare the numbers using a place-value chart.
Then write “>”, “<” or “=”.
a. 125 290
100 000s
125 690
10 000s
1 000s
100s
10s
1s
125 290 _____ 125 690
Arrange the numbers in order.
25 034
25 340
25 304
25 300
25 043
__________ < ___________ < ___________ < ___________ < __________
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Estimate where these numbers go on the number line.
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25 000
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25 500
Describe how to look for the smallest and greatest numbers.
Rounding Numbers
1.
The Chenab River flows in India and Pakistan.
It is 1086 km long.
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1080
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1090
Is 1086 nearer to 1080 or 1090? ________
1086 rounded to the nearest 10 is ________
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2.
Here are the lengths of some other rivers in Asia.
a. Round each number to the nearest 10 100 and 1000.
Length of the
River
Hong River,
1149 km
Yellow River,
5464 km
Mekong River,
4909
b.
10 km
Round to the nearest
100 km
1000km
If you are estimating the length of a river, is it more useful to round
the numbers to the nearest 10, 100 or 1000 km? Which is the most
useful way?
c. The given numbers round to 125 000 when rounded to the nearest 1000.
Fill in the missing digits to make the statement true.
12__ 590
12 __90
124 ______
Ron makes two numbers.
Both numbers have five digits and have a difference of 5.
The first number rounds to 50 000.
The second number rounds to 51 000.
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What could the two numbers be?
3. The distance around Venus is 38 025 km.
a. Round this distance to the nearest 10 000 km.
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30 000
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40 000
38 025 km rounded to the nearest 10 000 km is ____________ km.
b. Round the distance to the nearest 100 000 km.
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0
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100 000
38 025 km rounded to the nearest 100 000 km is ________ km.
c. Look at a and b. Is it more useful to round the number to the nearest 10 000 km
or 100 000 km? Explain why.
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3. The table shows the distance around different planets in the solar system.
Round each number to the nearest 10 000 km and 100 000 km.
Distance round the
planet
Neptune,
154 705 km
Saturn,
378 675 km
Uranus,
160 590 km
Rounded to the nearest
10 000 km
Rounded to the nearest
100 000 km
Numbers less than 0
1. Complete the table.
a.
In words
In figures
Negative twenty-six
-61
Negative one hundred and two
b. What does the digit 6 mean in -26 and -61?
c. What does the digit 8 mean in -83 and -321?
2. Eddy is at the first basement of a building.
Write where he is in figures and in words.
In figures: ___________ In words: _____________________________________
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