Singapore Maths at Harris Workshop 3
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Transcript of Singapore Maths at Harris Workshop 3
Using Bar Model to Solve Word Problems involving whole numbers, fractions, ratios and
algebra H a r r i s F e d e r a t i o n , L o n d o n O c t o b e r 2 0 1 2
Yeap Ban Har
Marshall Cavendish Institute Singapore
Slides are available at
www.banhar.blogspot.com
Mathematics is “an excellent vehicle for the
development and improvement of a person’s
intellectual competence”. Ministry of Education Singapore 2006
Larry
Maria
4 units = $300
1 units = $300 4 = $75
3 units = 3 x $75 = $300 - $75 = $225
Maria gets $225.
Ratio Example 1
King Solomon Academy, London
John
Mary
$100 - $34 = $66
Whole Numbers Example 2
John has $34 more than Mary.
Together, they have $100.
How much money does each of them have? Royston Primary School, London
$34
$66 2 = $33
Mary has ….
John has ….
GCSE Example 4
Last year Jora spent
30% of his salary on rent
of his salary on entertainment
of his salary on living expenses.
He saved the rest of his salary.
Jora spent £3600 on living expenses.
Work out how much money he saved.
5
2
4
1
10
3%30
10
4
5
2
20
5
4
1
20
8
20
6
4 x £3600 = £12000 + £2400 = £14400
20
19
20
5
20
8
20
6Jora spent:
Jora saved: 20
1
20
191
£14400 20 = £1440 2 = £…..
GCSE Example 4
Last year Jora spent
30% of his salary on rent
of his salary on entertainment
of his salary on living expenses.
He saved the rest of his salary.
Jora spent £3600 on living expenses.
Work out how much money he saved.
5
2
4
1
5 units =£3600
1 unit = £3600 5 = £360 x 2
= £720