1. Rounding – to the nearest 10
1 9 5
5 or more?
5 or more?
5 or more? No
Yes
Yes
2 0 0

2. Rounding – to the nearest 100
8 9
5 or more?
5 or more?
5 or more? No
Yes
Yes
1 0 0
Copy &
complete
this table:
Number
To nearest 10
To nearest 100
To nearest 1000
37 521
9 875
452
37520
37500
38000
274500
274500
275000
Your Turn
9880
9900
10000
450
500

3. Rounding to 1 Decimal Place (1DP)
5 or more?
5 or more?
5 or more? No No
Yes
4 . 8
4 . 8
4 . 9
5 or more?
5 or more?
5 or more?
Yes
Yes
Yes
4 . 9
5 . 3
2 . 0

4. Rounding to Decimal Places: 2DP
5 or more?
5 or more?
5 or more? No
Yes
Yes
5 or more?
5 or more?
5 or more? No
Yes
Yes

5. Rounding to Decimal Places: 3DP
5 or more?
5 or more?
5 or more?
Yes No
Yes
5 or more?
5 or more?
5 or more? No
Yes
Yes

6. Rounding to Decimal Places
1DP
2DP
3DP
5 or more?
5 or more?
5 or more?
Yes No
Yes
4 . 9
Copy &
complete
this table:
Number
To 1DP
To 2DP
To 3DP
63.5
63.47
63.472
87.7
87.66
87.656
Your Turn
150.0
149.99 D
3.5
3.54
3.540
0.6
0.60
0.600

7. Significant Figures: Important Zeros in Numbers5 2 a.
Which zeros matter?
Are there any we could get rid of and still have the same value? 5 . 2 b. . 5 c. 2 . 5 d.
When dealing with Significant Figures, you need to keep any zeros that tell us the value of a number

8. Rounding to 1 Significant Figure (1SF)
5 or more?
5 or more?
5 or more?
Yes No No 1
2 4 1
5 8 7
7 5
5 or more?
5 or more?
5 or more? No
Yes
Yes
2 0 0
6 0 0
8 0

9. Rounding to 2 Significant Figure (2SF)
5 or more?
5 or more?
5 or more?
Yes No
Yes
1 . 4
5 or more?
5 or more?
5 or more?
Yes No
Yes

10. Rounding to 3 Significant Figure (3SF)
5 or more?
5 or more?
5 or more? No No No
5 or more?
5 or more?
5 or more?
Yes
Yes
Yes

11. Rounding to Significant Figures
1SF
2SF
3SF
5 or more?
5 or more?
5 or more?
Yes
Yes
Yes
Copy &
complete
this table:
Number
To 1SF
To 2SF
To 3SF
6.3528
34.026
6.0
6.4
6.35
30.0 34 34
Your Turn
0.006
0.0057 C
200
150
151