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Rounding Numbers 1
The nearest 100 to 641 is 600.

Rounding Numbers 1

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Rounding numbers down or up involves reducing or increasing them to the nearest ten or hundred. When we round a number we say which is the nearest ten or hundred to that number. That's easy to do with most numbers, but what about ones that end in a 5 or a 50? Well, these are always rounded up rather than down.

1 .
Which of these numbers would be rounded down to the nearest 10?
36
25
19
91
25 is rounded up as it ends in a 5
2 .
Why is rounding 45 more difficult?
It is half way between 40 and 50
It is a multiple of 9
It is an odd number
It is half way between 0 and 50
As 45 is half way between 40 and 50 the rule is to always round 5 up
3 .
In which of these questions would you need to round the answer up?
A box holds 6 cakes. How many boxes will I need to hold 34 cakes?
Tickets cost £5. I have £22 how many tickets can I buy?
Candies cost 20p. I have £1. How many candies can I buy?
A pencil is 10cm. How long will 3 pencils be?
34 ÷ 6 = 5 with 4 left over. As the remaining 4 need to go in a box 6 boxes are needed
4 .
Which of these numbers would be rounded down to the nearest 100?
134
250
879
191
Just as 5 is rounded up to 10, 50 is rounded up to 100 so 250 would not be rounded down
5 .
What is the nearest 100 to 850?
700
800
900
1,000
As the number ends in 50 we always round up to the nearest 100
6 .
Which is the nearest 10 to 33?
10
20
30
40
33 is closer to 30 than 40
7 .
Which is the nearest 10 to 75?
70
80
90
100
Remember that 5s are rounded up not down
8 .
What is the nearest 100 to 641?
600
700
800
1,000
As 41 is less than 50, 641 is rounded down to 600
9 .
Which is the nearest 100 to 379?
100
200
300
400
379 is closer to 400 than to 300
10 .
Which is the nearest 10 to 87?
80
90
100
200
87 is only 3 less than 90
Author:  Amanda Swift

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