my learning outcome… i will learn… how to round to whole numbers, decimal places and significant...
TRANSCRIPT
My Learning Outcome…
I will learn…
How to round to whole numbers , decimal places and significant figures.
I will apply my learning by…
Rounding .
I will evaluate my learning by…
Explaining to your partner how to round to 1 significant figure?
L4
Rounding to nearest 10 or 100.
L5
Rounding to decimal places. L6
Rounding to significant figures.
L7:
Be bale to understand standard form.
Learning Objective:
Application Tasks…
Key words: SquareTriangle
trapezium
Rounding – to the nearest 10
Yes
4 8 3 2
No5 or
more?
4 8 3 0
4 8 3 75 or
more?
4 8 4 0
Yes
1 9 55 or
more?
2 0 0
L 4
Learn
Rounding – to the nearest 100
Yes
1 5 8 2 3 1
No
1 5 8 2 0 0
5 8 7 2 5 or
more?
5 9 0 0
Yes
8 95 or
more?
1 0 0
You
r Tu
rn
Copy & completethis table:
5 or more?
Number To nearest 10
To nearest 100
To nearest 1000
37 521
274 503
7 630 918
9 875
452
380003750037520
275000274500274500
763100076309007630920
1000099009880
0500450
L 4Apply
Rounding to 1 Decimal Place (1DP)
No
4 . 8 3 2 5
No5 or
more?
4 . 8
4 . 8 4 2 5 5 or
more?
4 . 8
Yes
4 . 8 5 2 5 or
more?
4 . 9
Yes
4 . 8 7
Yes
5 or more?
4 . 9
5 . 2 6 7 1 4 5 or
more?
5 . 3
Yes
1 . 9 6 7 5 or
more?
2 . 0
L 5 Learn
Rounding to Decimal Places: 2DP
Yes
4 . 8 3 2 5
No 5 or more?
4 . 8 3
4 . 8 4 6 5 or
more?
4 . 8 5
Yes
4 . 8 5 9 5 1 5 or
more?
4 . 8 6
Yes
1 . 6 9 4 9
No 5 or more?
1 . 6 9
5 . 2 6 7 1 5 or
more?
5 . 2 7
Yes
1 . 8 9 7 5 or
more?
1 . 9 0
L5Learn
Rounding to Decimal Places: 3DP
No
4 . 8 3 2 5
Yes
5 or more?
4 . 8 3 3
4 . 8 4 6 2 5 or
more?
4 . 8 4 6
Yes
4 . 8 5 9 5 5 or
more?
4 . 8 6 0
Yes
1 . 6 9 4 2
No 5 or more?
1 . 6 9 4
5 . 2 6 2 7 5 or
more?
5 . 2 6 3
Yes
1 . 9 9 9 9 5 or
more?
2 . 0 0 0
L5Learn
Rounding to Decimal Places
Yes
5 . 2 6 2 7 5 or
more?
5 . 2 6 3
1 . 6 9 4 9
No 5 or more?
1 . 6 9
Yes
4 . 8 5 2 5 or
more?
4 . 9
You
r Tu
rn
Copy & completethis table:
Number To 1DP To 2DP To 3DP
63.4721
87.6564
149.9875
3.54029
0.59999
63.5 63.47 63.472
87.7 87.66 87.656
150.0 149.99 149.988
3.5 3.54 3.540
0.6 0.60 0.600
3DP2DP1DP
D
Apply
Significant Figures: Important Zeros in Numbers
5 2 0 0 0
5 . 2 0 0
0 . 0 5 0
0 2 . 5 0
a.
b.
c.
d.
Which zeros matter?
Are there any we could get rid of and still
have the same value?
When dealing with Significant Figures, you need to keep any zeros that tell us the value of a number
L6Learn
Rounding to 1 Significant Figure (1SF)
No
0 . 0 7 6 5
Yes
5 or more?
0 . 0 8
0 . 0 0 1 2 5 or
more?
0 . 0 0 1
No
1 . 0 0 9 5 5 or
more?
1
Yes
2 4 1
No 5 or more?
2 0 0
5 8 7 5 or
more?
6 0 0
Yes
7 55 or
more?
8 0
L6Learn
Rounding to 2 Significant Figure (2SF)
No
1 4 7 2
Yes
5 or more?
1 5 0 0
1 . 4 2 7 9 5 or
more?
1 . 4
Yes
0 . 0 5 3 5 5 or
more?
0 . 0 5 4
No
4 2 7 2 8
Yes
5 or more?
4 3 0 0 0
2 0 4 4 7 8 5 or
more?
2 0 0 0 0 0
Yes
0 . 0 6 9 6 5 or
more?
0 . 0 7 0
L6Learn
Rounding to 3 Significant Figure (3SF)
No
0 . 0 2 6 7 1
No 5 or more?
0 . 0 2 6 7
3 . 2 9 4 9 5 or
more?
3 . 2 9
No
3 4 7 2 8 5 or
more?
3 4 7 0 0
Yes
1 3 7 9 8
Yes
5 or more?
1 3 8 0 0
9 7 4 9 7 8 5 or
more?
9 7 5 0 0 0
Yes
1 2 . 0 6 9 5 or
more?
1 2 . 1
L6Learn
Rounding to Significant FiguresYou
r Tu
rn
Copy & completethis table:
Number To 1SF To 2SF To 3SF
6.3528
34.026
0.005708
150.932
0.00007835
3SF2SF1SF
0 . 0 7 6 5
Yes
5 or more?
0 . 0 8
4 2 7 2 8
Yes
5 or more?
4 3 0 0 0
Yes
1 2 . 0 6 9 5 or
more?
1 2 . 1
6.35 6.4 6
34.0 34 30
0.00571 0.0057 0.006
151 150 200
0.0000784 0.000078 0.00008C
Apply
You need to understand about powers of 10.Try these to test your previous knowledge.
102
103
10-2
106 10-3 Remember this?
100
101
10-1
(Use the worksheet “powers of ten” for further explanation)
105
104
Learn
Standard Form is used a lot in maths andscience as a convenient way of writing very
large, or very small numbers for example:
The distance from the earth to the sun is
149 000 000 km
A hydrogen atom has a diameter of about
0.000 000 2 mm
huge!
microscopic!
Learn
Let’s deal with large numbers first.
Look at how these numbers have been broken down:
500 = 5 × 100
5000 = 5 × 1 000
50 000 = 5 × 10 000you know how to writethese as powers of 10
= 5 × 102
= 5 × 103
= 5 × 104
Learn
What about these?
550
5 500
55 000
= 5.5 × 100 = 5.5 × 102
= 5.5 × 1 000
= 5.5 × 10 000
= 5.5 × 103
= 5.5 × 104
Learn
Put these numbers into standard form:
6 000
9 000
4 00 000
80 000
400 450
4 000
550003500
750 000
= 6 × 103
= 4 × 102
= 8 × 104
= 9 × 103
= 4 × 105
= 4 × 103
= 4.5 × 102
= 5.5 × 104
= 3.5 × 103
= 7.5 × 105
Learn
Standard form is:
a number between 1
and 10× a power
of ten
but not including 10 positive or negative
Learn
Now try writing these numbers in standard form:
5 000 000
5 500 000
5 250 000
5 100 000
5 156 342
= 5 × 106
= 5.5 × 106
= 5.25 × 106
= 5.1 × 106
= 5.156342 × 106
Apply
Reverse! Change each of these numbers to an ordinary number
6 × 102
2 × 103
5 × 107
9 × 108
3.7 × 109
2.8 × 101
9.9 × 1010
7.1 × 104
3.97 × 102
8.172 × 102
Learn
The next stage is to write very small numbers, i.e. numbers less than 1
Check that you understand about negative powers of 10
0.1 = 1 = 10-1
10
0.001 =
0.00001 =
0.01 =
0.0001 =
Learn
Write in standard form:
0.007
0.04
0.000 000 005
0.0234
0.000 002 3
0.006 7
0.000 000 002 34
0.006 7
0.3
0.000 045
Apply
*Change to small numbers
3.5 × 10-1
4.5 × 10-4
7.2 × 10-5
6.1 × 10-3
1.17 × 10-10
Apply
Change each of these to a large or small number:
5.5 × 10-6
6.5 × 10-8
3.2 × 105
2.9 × 102
3.167 × 10-11
1.115 × 104
1.412 × 10-3
7.2 × 101
9.01 × 10-2
1.17 × 106
Apply
*Evaluate
*How do you round to the nearest Significant figure?