Numeracy Worksheet - Castlebrae Community High School - 2012 Page 20
ADVERTISEMENT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47FHS Numeracy
Estimation : Rounding
contents page
Numbers can be rounded to give an approximation.
The number to the right of the place value to which we want to round
tells us how to round.
Example 1
2652
Level 2
2600
2610
2620
2630
2640
2650
2660
2670
2680
2690
2700
2 is to the right of the 10’s column.
2652 rounded to the nearest 10 is 2650.
Round down.
2652 rounded to the nearest 100 is 2700.
5 is to the right of the 100’s column.
Round up.
2652 rounded to the nearest 1000 is 3000
6 is to the right of the 1000’s column.
Round up.
When rounding numbers that lie exactly in the middle it is convention
to ALWAYS round UP.
Example 2
345 to the nearest 10
Level 2
345 = 350 to the nearest 10
In general, to round a number, we must first identify the place value to which
we want to round.
We must then look at the next digit to the right (the “check digit”).
If the “check digit” is less than 5 (0, 1, 2, 3, 4) round down.
If the “check digit” is 5 or more (5, 6, 7, 8, 9) round up.
20
L Watson 2012
ADVERTISEMENT
0 votes
Related Articles
Related forms
Related Categories
Parent category: Education