round decimals to the nearest whole number oma. simplifying fractions learning objective
TRANSCRIPT
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Round decimals to the nearest whole number
OMAOMA
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Simplifying
Fractions
Learning ObjectiveLearning Objective
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Simplified Fractions
To simplify a fraction, we find an equivalent fraction which uses the smallest numbers possible.
We do this by dividing.
We need to know our tables for this!Ask yourself, what can I divide both 24 and 40 by?8 is the biggest number we can divide both by and 3/5 uses the smallest possible numbers as we cannot divide them by anything else.
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Look at this one
2856
The first thing I notice is that 28 and 56 are both in the 7 times table. So I’m going to divide both numbers by 7.
2856
÷÷
47=7=
8
Is this simplified?
NO!
48
I can still divide both numbers by 4.
÷÷
4=4=
1
8
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Let’s work through this together.
4860
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Try this one with a partner2163
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Try this one with a partner4590
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Try this one with a partner3256
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Abacus Page 77 and 78
YOUR TASK!
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OMA
Round Decimal numbers to the
nearest 10th or 100th
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Learning Objective
Consolidate recognition of equivalent fractions.
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Equivalent fractions
1 whole
1/21/2
1/41/4
1/41/4
1/81/8
1/81/8
1/81/8
1/81/8
We are learning about equivalent fractions
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1 whole
½ ½
¼¼¼¼
1/81/8
1/81/8
1/81/8
1/81/8
We can see that
1/1 = 2/2 = 4/4 = 8/8
They are equivalent fractions
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We can see that 2/8 is the same length as 1/4
So 2/8 = 1/4
They are equivalent fractions
1 whole
1/21/2
1/41/4
1/41/4
1/81/8
1/81/8
1/81/8
1/81/8
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½
¼¼
1/81/8
1/81/8
Which fractions are equivalent to ½?
1 whole
1/2 = 2/4 = 4/8
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Which of these fractions is equivalent to 1/4 ?
2/81/8
1/2
1 whole
1/21/2
1/41/4
1/41/4
1/81/8
1/81/8
1/81/8
1/81/8
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2/41/4
Which of these fractions is equivalent to 4/8 ?
1/8
1 whole
1/21/2
1/41/4
1/41/4
1/81/8
1/81/8
1/81/8
1/81/8
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1 whole
1/31/3
1/3
1/61/6
1/61/6
1/61/6
1/121/12
1/121/12
1/121/12
1/121/12
1/121/12
1/121/12
=
1/32/6
4/12
=
Look at the equivalent fractions – each time the numerators double, the denominators also double.
Which other fraction will be equivalent?
6/244/24
8/24
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Equivalent Fractions
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We can see that ½ is the same as 2/4, 3/6, 4/8 and 5/10.These are EQUIVALENT FRACTIONS.
Find me an equivalent of:
2/8 3/9 8/10 9/9 4/6
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How do we know that two fractions are the same?
We cannot tell whether two fractions are the same until we simplify them to their lowest terms.A fraction is in its lowest terms (simplified) if we cannot find a whole number (other than 1) that can divide into both its numerator and denominator (A common factor).Examples:
is not reduced because 2 can divide into both 6 and 10.
is not reduced because 5 divides into both 35 and 40.
10
6
40
35
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How do we know that two fractions are the same?More examples:
is not reduced because 10 can divide into both 110 and 260.
is reduced.
is reduced
260
110
15
8
23
11
To find out whether two fraction are equal, we need to reduce them to their lowest terms.
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How do we know that two fractions are the same?
Examples:
Are21
14 and 45
30 equal?
21
14 reduce3
2
721
714
45
30 reduce9
6
545
530 reduce
3
2
39
36
Now we know that these two fractions are actually the same!
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How do we know that two fractions are the same?
Another example:
Are and equal?
reduce
reduce
This shows that these two fractions are not the same!
40
24
42
30
42
30
40
24
20
12
240
224 reduce
5
3
420
412
7
5
642
630
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Miss Newton: NHM Page 41
Mrs Todd: NHM Page 41 Mrs Byrne: Abacus Page
77
YOUR TASK!
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OMA
Simplify the following Fractions…
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Learning Objective
To compare and order Fractions
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Ordering fractions
1 2 3 4 7
9 9 9 9 9
(if ordered smallest largest)
If the DENOMINATOR is the same, look at the NUMERATORS, and put the fractions in order.
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Ordering fractions
We need to convert our fractions to EQUIVALENT fractions of the same DENOMINATOR. We will come back to this example.
If the DENOMINATOR is different, we have a problem that must be dealt with differently.
3 7 4 1 2
6 8 4 3 4
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Ordering fractions
If the DENOMINATOR is the different, we have a problem that must be dealt with differently.
4 3
6 9
Here’s an easier example, with just 2 fractions to start us off.
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Ordering fractions
Look at the denominators. We must look for a COMMON MULTIPLE.
4 3
6 9
This means that we check to see which numbers are in the 6 times table, and the 9 times table. We need a number that appears in both lists.
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Ordering fractions
Look at the denominators. We must look for a COMMON MULTIPLE.
Multiples of 6 are
6, 12, 18, 24, 30, 36, 42, 48, 54, 60……
Multiples of 9 are
9, 18, 27, 36, 45, 54, 63, 72, 81, 90……
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Ordering fractions
COMMON MULTIPLES are:
Multiples of 6 are
6, 12, 18, 24, 30, 36, 42, 48, 54, 60……
Multiples of 9 are
9, 18, 27, 36, 45, 54……
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Ordering fractions
COMMON MULTIPLES are:
18, 36 and 54. There are others that are higher, but we only look at smaller numbers.
Remember: Smaller numbers are SIMPLER.
18 is the smallest number that is common, so we’ll use this.
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Ordering fractions
4
6
We need to convert these fractions so they have the same denominator.
?
18x 3
x 3
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Ordering fractions
4
6
We need to convert these fractions so they have the same denominator.
12
18x 3
x 3
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Ordering fractions
3
9
We need to convert these fractions so they have the same denominator.
?
18x 2
x 2
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Ordering fractions
3
9
We need to convert these fractions so they have the same denominator.
6
18x 2
x 2
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Ordering fractions
4 3
6 9
So these fractions:
Are EQUIVALENT to these ones:
6
18
12
18
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Ordering fractions
3 4
9 6
And this is the correct order
Because these EQUIVALENT FRACTIONS are in order
12
18
6
18
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Ordering fractions
The LOWEST COMMON DENOMINATOR is 24 – check for all the multiples of the DENOMINATORS. 24 is the first number to appear in all the lists.
Remember our example
3 7 4 1 2
6 8 4 3 4
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Ordering fractions
The LOWEST COMMON DENOMINATOR is 24 – check for all the multiples of the DENOMINATORS. 24 is the first number to appear in all the lists.
Convert to 24ths
12 21 24 8 12
24 24 24 24 24
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Ordering fractions
This tells you how large our fractions are. Check which order they go in.
Convert to 24ths
12 21 24 8 12
24 24 24 24 24
2nd 4th 5th 1st 3rd
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Ordering fractions
This tells you how large our fractions are. Check which order they go in.
Convert to 24ths
2nd 4th 5th 1st 3rd
3 7 4 1 2
6 8 4 3 4
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Ordering fractions
So this is the correct order
1 3 2 7 4
3 6 4 8 4
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Ordering Fractions 2
If we want to order fractions, we need to make sure our working out is clear.
For every question, please use the following method.
5 7 3 3
9 12 6 4
We look for a COMMON MULTIPLE.
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Ordering Fractions 2
5 7 3 3
9 12 6 4
Look at the DENOMINATORS. What are the MULTIPLES?
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Ordering Fractions 2
5 7 3 3
9 12 6 4
9: 9, 18, 27, 36, 45, 54, …
12: 12, 24, 36, 48, 60, …
6: 6, 12, 18, 24, 30, 36, 48, …
4: 4, 8, 12, 16, 20, 24, 28, 32, 36,…
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Ordering Fractions 2
5 7 3 3
9 12 6 4
Use 36 as the COMMON DENOMINATOR.
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Ordering Fractions 2
5 7 3 3
9 12 6 4
36 36 36 36
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Ordering Fractions 2
5 7 3 3
9 12 6 4
36 36 36 36
x 4 x 3 x 6 x 9
Find the number that you need to multiply the DENOMINATORS by to get 36.
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Ordering Fractions 2
5 7 3 3
9 12 6 4
36 36 36 36
x 4 x 3 x 6 x 9
Multiply the NUMERATORS by the same amount as you multiplied the DENOMINATORS
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Ordering Fractions 2
5 7 3 3
9 12 6 4
20 21 18 27
36 36 36 36
x 4 x 3 x 6 x 9
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Ordering Fractions 2
5 7 3 3
9 12 6 4
20 21 18 27
36 36 36 36
x 4 x 3 x 6 x 9
2nd 3rd 1st 4th
Decide which order the fractions need to be in.
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Ordering Fractions 2
5 7 3 3
9 12 6 4
20 21 18 27
36 36 36 36
x 4 x 3 x 6 x 9
2 3 1 4
18 20 21 27
36 36 36 36
putting them in order…
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Ordering Fractions 2
5 7 3 3
9 12 6 4
20 21 18 27
36 36 36 36
x 4 x 3 x 6 x 9
2 3 1 4
18 20 21 27
36 36 36 36
Now convert them back…
3 5 7 3
6 9 12 4
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Ordering Fractions 2
and the final answer…5 7 3 3
9 12 6 4
20 21 18 27
36 36 36 36
x 4 x 3 x 6 x 9
2 3 1 4
18 20 21 27
36 36 36 36
3 5 7 3
6 9 12 4
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Miss Newton: Abacus Page 78
Miss Byrne: Abacus Page 79
Miss Todd: Abacus Page 80
YOUR TASK!
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Round decimals to the nearest whole
number, tenth or hundredth.
OMAOMA
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Learning Objective
Consolidate changing an improper Fraction to a mixed number
and vice versa
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FRACTIONS 14
14
14
14
14
14
14
14+ + + =
44 = 1
14
14
14
14
14
=54 = 1
14
14
14
14+ + +
14+
14
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FRACTIONS 13
13
13
13
13
13+ + =
33 = 1
13
13
13
13
13
13
13
73
= 2 13
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FRACTIONS 13
13
13
13
13
13
13
73
= 2 13
Improper Fraction Mixed Number
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FRACTIONS 15
15
15
15
15
15
15
15
85
= 1 35
Improper Fraction Mixed Number
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FRACTIONS 16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
156
= 2 36
Improper Fraction Mixed Number
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FRACTIONS 14
14
14
14
14
14
14
14
14
14
14
14
14
14
14
154
= 3 34
Improper Fraction Mixed Number
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To convert an improper fraction to a mixed
number what do you do?
If it isn’t a whole number then keep the
denominator the same.
Numerator ÷ Denominator
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85
1 35
74
1 34
136
2 16
3 13
103
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YOUR TASK!
Miss Newton’s Group and Mrs Byrne’s Group: pg 21Miss Todd’s Group– Nh6 pg 41 and 42
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Multiply decimals using grid method.
OMAOMA
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Learning Objective
Revise knowledge of converting
Fractions, Decimals and Percentages.
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The connection between fractions, decimals and percentages.
Share into 100 equal parts. FractionDecimal %
1100
0.01 1%
2100
0.02 2%
3100
0.03 3%
4100
0.04 4%
5100
0.05 5%
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The connection between fractions, decimals and percentages.
Share into 100 equal parts. FractionDecimal %
6100
0.06 6%
7100
0.07 7%
8100 0.08 8%
9100 0.09 9%
0.10 10% 100
10 10
1
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The connection between fractions, decimals and percentages.
Share into 100 equal parts.
Fraction Decimal %
0.10 10% 10
1 100
100.20 80%
10
2 100
200.30 20%
10
3 100
300.40 40%
10
4 100
400.50 50%
10
5 100
500.60 60%
10
6 100
600.70 70%
10
7 100
700.80 80%
10
8 100
800.90 90%
10
9 100
901.00 100%
10
10 100
100
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The connection between fractions, decimals and percentages.
Share into 100 equal parts.
Fraction Decimal %
0.25 25% 100
25 4
10.50 50%
100
50 2
10.75 75%
100
75 4
31.00 100%
100
100 1
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TENTHS AND FIFTHS
10
2=
= 0.20 5
1
So find a tenth and double it!
To convert 3/5 to a decimal.
Convert 3/10 = 0.3
Double it to get 0.6!
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Now convert these to decimals…
25% 20%80% 43%
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Now convert these to Fractions…
25% 20%80% 43%
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Can you reduce them to their
simplest form?
25% 20%80% 43%
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Convert these Decimals to a Fraction and a Percentage…
0.50 0.750.40 0.64
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YOUR TASK!
NHM Page 66