Bar Model Method in Primary Mathematics 5 Dec 2013 | MAV Annual Conference Dr Yeap Ban Har [email protected] Marshall Cavendish Institute Slides are available at www.banhar.blogspot.com The Merlion by Yeap Ken Min
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Bar Model Method in Primary Mathematics 5 Dec 2013 | MAV Annual Conference Dr Yeap Ban Har [email protected] Marshall Cavendish Institute Slides are available at www.banhar.blogspot.com
The Merlion by Yeap Ken Min
| Hanusek, Jamison, Jamison & Woessmann 2008
“Upon separation from Malaysia in 1965, Singapore
was faced with … high levels of unemployment and
poverty. 70% of Singapore’s households lived in badly
overcrowded conditions, and a third of its people
squatted in slums on the city fringes. Unemployment
averaged 14%, GDP per capita was less than $2,700,
and half of the population was illiterate. “
Using concrete and
pictorial representations
help students acquire
abstract ideas
Seely Place Elementary School, New York
Escuela de Guetamala, Chile
6
6
6
6
Let’s warm up with a typical textbook problem.
Sumin has 1135 local coins. He has three times as many foreign coins as local coins. Sumin puts the coins equally into 5 boxes.
Example 0 Typical Word Problems
Sumin has 1135 local coins. He has three times as many foreign coins as local coins.
number of
local coins
number of
foreign coins
1135
number of foreign coins = 3 x 1135
= 3300 + 105
= 3405
Sumin puts the coins equally into 5 boxes.
number of
local coins
number of
foreign coins
3405
Sumin puts the coins equally into 5 boxes.
4540 5 =
There are coins in each box.
Example 1 Learning Basic Ideas
3
2
3
1
Seely Place Elementary School, New York
Seely Place Elementary School, New York
Example 2 Learning Basic Ideas 512 x
1
5
Example 2 Learning Basic Ideas 512 x
1
5
152 x
Example 3
The ratio of the number of boys to the number of girls in a school is 6 : 5 . There are 1353 children in the school.
What questions can we answer?
Example 4
Box B contains twice as many books as Box A. Box C contains 20
more books than Box A. Together, the three boxes contains 116
books.
Box B contains twice as many books as Box A. Box C contains 20
more books than Box A. Together, the three boxes contains 116
books.
Box B contains twice as many books as Box A. Box C contains 20
more books than Box A. Together, the three boxes contains 116
books.
A
B
C 20
116
A
B
C 20
116 - 20
4 units = 116 - 20
4 units = 96
1 units = 96 4
1 units = 20 + 4 = 24
What questions can we answer?
Edgewood Elementary School, New York
Box B contains twice as many
books as Box A. Box C
contains 20 more books than
Box A. Together, the three
boxes contains 116 books.
Edgewood Elementary School, New York
A
B
C 20
116 x
x x
x
x + 2x + x + 20 = 116
4x = 116 – 20 = 96
x = 96 4 = …
Example 5 Homework
A challenging problem for Primary 5.
Lesson Date //
Lesson Date //
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