map213 teaching of algebra hilo day 5
TRANSCRIPT
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algebrain singapore
m a t h
Dr Yeap Ban HarMarshall Cavendish Institute
Slides are available at
www.banhar.blogspot.comHawa
i’iwww.facebook.com/MCISingapore
Marshall Cavendish Institute www.mcinstitute.com.sg
M A P 2 1 3
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si.mcinstitute.com.sg
More information at
www.si.mcinstitute.com.sg
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Some Questions from Participants
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www.eaieducation.com
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http://moe.edu.sg/education/education-statistics-digest/average class size
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Algebraic Thinking Model Method
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Peter
Natalia
x
x 12
58 – 12 = 4646 2 = 23
Peter’s bag weighs 23 kg.Natalia’s bag weighs 23 kg + 12 kg = 35 kg.
23
462
12582
58122
58)12(
x
x
x
x
xx
Page 7 MAP111
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• Managing information through word problems
• Visualization through drawing bar models
• Number sense through mental calculation
• Evaluating solutions through discussing solutions to anchor task
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1st Day
2nd Day 4
3rd Day 4 4
4th Day 4 4 4
5th Day 4 4 4 4
6th Day 4 4 4 4 4
7th Day 4 4 4 4 4 4
8th Day 4 4 4 4 4 4 4
250
Page 8 MAP111
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1st Day
2nd Day 4
3rd Day 4 4
4th Day 4 4 4
5th Day 4 4 4 4
6th Day 4 4 4 4 4
7th Day 4 4 4 4 4 4
8th Day 4 4 4 4 4 4 4
250
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = ?
There are 45 fours.45 x 4 = 180
10 units = 250 – 180 = 7001 units = 70 10 = 7
She made (7 + 9 x 4) = 43 paper cranes on the last day.
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1st Day
2nd Day 4
3rd Day 4 4
4th Day 4 4 4
250
5
5th Day 4 4 4 4
250 – 40 = 210
210 5 = ?
42 + 16 = ?
Rosa made 58 paper cranes on the last day.
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x
x
x
x
x
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Struggling Average Advanced
Draw the model for all 10 days. Or reduce the problems to 4 days. Or act the situation out using counters.
Draw the model for about 7 or 8 days.
Draw the model for 3 or 4 days. Using algebra.
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1st Day x
2nd Day x 4
3rd Day x 4 4
4th Day x 4 4 4
5th Day x 4 4 4 4
6th Day x 4 4 4 4 4
7th Day x 4 4 4 4 4 4
8th Day x 4 4 4 4 4 4 4
x + (x + 4) + (x + 8) + (x + 12) + … = 250
x + (x + 4) + (x + 8) + (x + 12) + … (x + 36) = 250
10x + (4 + 8 + 12 + … + 32 + 36) = 250
10x + (40 4 + 20) = 250
10x + 180 = 250
10x = 70
x = 7 x + 36 = 43
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Differentiation for Struggling Learners
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Sam
Terry
Vanessa
72
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y y
y
Sam
Terry
Vanessa y y y
72
6y = 72
y = 72 6 = 12
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Sam
Terry
Vanessa
72
36 years old
36
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Vanessa
Terry72
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Differentiation for Advanced Learners
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Sam
Terry
Vanessa
72
Sam
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Pablo
Wynn
Zena
100
?
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210
38
15
38
−15=
740
740
→210
140
→210 7=30
3040
→30 × 30=900
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Courtesy of one of our colleagues
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Algebraic Expressions
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2
1
5
43
numberstotal
middle number
1, 2, 3, 4, 5
2, 3, 4, 5, 6
3, 4, 5, 6, 7
89
10
135
111213
246
141516
357
m, …
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m
m
m
Try it!
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Factoring
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Modeling with Algebra
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Grade Five
Grade Six
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