surviving math
DESCRIPTION
This is the seminar for parents hosted by the radio station Gold 90FM.TRANSCRIPT
Da Qiao Primary School, Singapore
St Edward School, Florida
Da Qiao Primary School, Singapore
17 – 3 =
17 – 8 =
17
10 7
17
14 3
17
9 8
Primary 1 Singapore
St Edward School, Florida
Grade 2 USA
Archipelschool De Tweemaster – Kameleon, The Netherlands
Grade 5 The Netherlands
Archipelschool De Tweemaster – Kameleon, The Netherlands
Grade 5 The Netherlands
King Solomon Academy, London
Year 7 England
www.marshallcavendish.com/education/mci
High School Attached to Tsukuba University, Japan
Draw a polygon with no dots inside it. Investigate.
A polygon has 4 dots on the perimeter. Find an expression for its area.
Grade 9 Japan
Students who have mastered the basic skills which include basic one-step and two-step problems are ready to handle at least the least demanding of the secondary courses.
999 – 724 = 275
1000 – 724 = 276
12 ÷ 4 = 3
2 tenths ÷ 4
20 hundredths ÷ 4
20 hundredths ÷ 4 = 5 hundredths
3.05
First Hall
Second Hall
Third Hall9 876 ÷ 3 = 3292
3292 ÷ 4 = 823
823 x 5 = 4000 + 100 + 15 = 4115The second hall (and also the first hall) has 4115 chairs.
First Hall
Second Hall
Third Hall
Handling Information- Metacognition- Adult models the behaviour
Representing Solution- Visualization- Adult coaches “Can you see..?”
Computation- Number Sense- Encourage mental computation
Answer:
43 x 1.2m42 x 1.2m = 42m + 8.4m = 50.4m
50.4m ÷ 36 = 1.4m
1.4
1.4
Handling Information / Correcting Mistake- Metacognition- Adult models the behaviour
Representing Solution- Visualization- Adult coaches – use a diagram- Look for a Pattern- Adult coaches – use questions
Checking Answer- Number Sense- Encourage sense making
Primary 5 student figuring out things on his own.
Number of Girls
11 sweets each
8 sweets each Possible?
3 22+6=28 24+25=49 No
4 33+6=39 32+25=57 No
5 44+6=50 40+25=65 No
6
7
8
9
25 + 2 = 27
27 ÷ 3 = 9
9 + 1 = 10 There were 10 girls.
10 x 8 + 25 = 105 There were 105 sweets.
27 sweets were returned when they decided to have 8 each instead of 11. As each girl returned 3 sweets, there must be 9 girls to return 27 sweets. The last girl took 2 (to make her 6 sweets 8). That is why there were 25 sweets left over.
Men
Women
30
14
13
38
2 units = 385 units = 19 x 5 = 95
14+13=712
512→95
1212→95÷512=19 12=190+38=228
Therewere 228 fruits altogether .
$3
$3 $3
$3 $3 $3
Monday
Tuesday
Wednesday
Thursday
$100
Monday
Tuesday
Wednesday
Thursday
$100 – 6 x $3 = $82
4 units = $821 unit = $82 ÷ 4 = $20.50
$20.50 + $9 = $29.50She saved $29.50 on Thursday.
dots on perimeter dots inside
12 0
8 2
4 4
Sent to me by GOLD 90FMMr Lim packed 387 apples. Each apple had a mass of about 24g. He put them into three different baskets. The mass of the apples in Basket A was 3 times that of the apples in Basket C. The mass of the apples in Basket B is twice that of the apples in Basket C. The mass of the empty Basket C was 140g. What was the total mass of Basket C and the apples in it?
A
B
C
387 x 24 g = 9288 g6 units = 9288 g1 unit = 1548 g
The total mass of Basket C and the apples in it is 1548 g + 140 g = 1688 g.
It is about 1.7 kg.
Jane + Xueling50 units
Xueling + Siti64 units
14 units = 14 shells1 unit = 1 shell
Siti collected 30 shells.Xueling collected 34 shells.
257
Jim
George
343 – 257 = 86Together they had 600 stamps
86
Working BackwardsJim’s 7 eighths 343Jim’s 8 eighths 392George had 208
George’s 2 fifths 208George’s 5 fifths 520Jim had 80
Jim’s 1 third 80Jim’s total at first 240George had 360 at first
(a) 41 is under M(b) 101 is under S(c) 2011 is under T …. Really? How do you know?