nctm2010 annual meeting & exposition session by yeap ban har on making connections: problems...
Post on 27-Jun-2015
1.361 Views
Preview:
DESCRIPTION
TRANSCRIPT
problemsfromsingapore
classroomsDr Yeap Ban HarNational Institute of EducationNanyang Technological University Singaporebanhar.yeap@nie.edu.sg
Slides available from www.mathz4kidz.com
MAKING CONNECTIONS
Da Qiao Primary School, Singapore
1 ÷ ¾ = ?
12 ÷ 4 = 3
1 ÷ ¾ = ?
12 ÷ 4 = 3
1 ÷ ¾ =
3
11
2 ÷ ¾ =
3
112
3 ÷ ¾ =
3
113
n ÷ ¾ = 3
11n
12 ÷ 4 = 3
3 ÷ ¾ = 4
makingconnections
12 ÷ 4 = 3
Primary Mathematics Standards Edition Grade 6
210
5
1
8
3
210
5
1
8
3
21040
7
5
1
8
3
3040
1
96040
32
5
4 Mrs Hoon sold 960
cookies.
Telok Kurau Primary School, Singapore
A lion weighs 135 kg. A cow weighs 87 kg more than the lion. An elephant weighs 139 more than the cow. How heavy is the elephant?
(Primary 2)
135 kg 87 kg 139 kg
Telok Kurau Primary School, Singapore
A lion weighs 135 kg. A cow weighs 87 kg more than the lion. An elephant weighs 139 more than the cow. How heavy is the elephant?
(Primary 2)
Shop A
Shop B
After
Shop A
Shop B
Before 156 kg
72kg
156 kg – 72 kg = 84 kg
3 units = 84 kg
1 unit = 84 kg ÷ 3 = 28 kg72 kg – 28 kg = 44 kg
Shop B sold 44 kg of rice.
Shop A sold 44 kg of rice.
handbag
half
$1890
handbag
three-fourths
$1890
handbag
three-eighths
$1890
handbag
28
16
14
8
7
4
12 units = $1890
1 unit = $1890 ÷ 12 = $
$1890
$1200 $690
$600 $90
$60 $30
1 unit = $1890 ÷ 12 = $157.50
35 units = $157.50 x 35 = $
Her salary is $5512.50 .
24
apples
pears192 + 24
8 units = 192 + 24 = 216
There were 5 x 27 apples at first.
There were 3 x 27 – 24 pears at first.
1 unit = 27
There were 78 more apples than pears at first.
women
men 12
45
5 parts
2 parts
women
menwomen men
50 10
55 11
60 12
… …
100 20
150 30
problemsfromsingapore
classroomsDr Yeap Ban HarNational Institute of EducationNanyang Technological University Singaporebanhar.yeap@nie.edu.sg
Slides available from www.mathz4kidz.com
MAKING CONNECTIONS
top related