Dividing a Whole Number by a Proper Fraction
Hundredths
Objective:
Materials:
To divide a whole number by a
proper fraction
• ‘Pizzas’ in quarters and thirds
(Template 6A1.5)
• Number lines in quarters and
thirds (Template 6A1.6)
• Scissors
Thinking Skill:
Analysing parts and wholes
Vocabulary:
Whole number, proper fraction,
divide, repeated subtraction
3
1
4
0
2
2
4
In the division of fractions, pupils
may invert the dividend instead
of the divisor.
Lesson:
• Through the use of the ‘pizzas’
and number line templates
(Templates 6A1.5 and 6A1.6),
act out the contexts shown on
CB p.17. Help pupils to link the
division of a whole number by
a proper fraction as repeated
subtraction on the number
line by counting backwards on the number line.
1
=4
4
1
3
4
Learning Difficulty:
Primary 6 CD-ROM:
Digital Coursebook 6A,
Chapter 1
Tom cut a pizza into quarters.
4
Class discussion
IT:
Dividing a Whole Number by a Proper
Fraction
1
Classroom Organisation:
1
from
4
one whole four times!
I can subtract
1
There are 4 quarters in one whole.
Tom cut 2 pizzas into one-thirds.
2
6
0
5
1
3
4
2
3
3
1
2
1
1
3
1
=6
3
1
1
2
3
1
from
3
2 wholes six times!
I can subtract
2
There are 6 one-thirds in 2 wholes.
17
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Maths Works! Teacher’s Guide 6A
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11/18/08 1:57:42 PM
Template 6A1.5: ‘Pizzas’ in quarters and thirds
40
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224
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11/12/08 7:34:20 PM
40
2
1
Date :
19%
b)
99%
4
90%
e)
Percentage
5%
d)
4
60%
90%
c)
75%
75%
60%
b)
40%
25%
25%
a)
5%
Choose from the percentages in the box to estimate the length of the
shaded part of each line. The first one has been done for you.
a)
What percentage of each figure is shaded?
I C a n Do
4
8
___
5
10
8%
80%
8
____
5
100
100
10
10
5 100%
d) ___
88
5 88%
b) ____
20
5 20%
4
5
a) ___
5 2%
4
5
b) ____
Express each fraction as a percentage.
20
200
4
d) 80% 5 __
1
5% 5 ___
c)
5
b) 42% 5
100
7
7% 5 ____
a)
Express each percentage as a fraction in its simplest form.
c)
a)
Express each fraction as a percentage.
Percentage
5
4
3
41