mathematics teaching for 21st century
DESCRIPTION
This is the keynote lecture delivered at the conference on 15 February 2012.TRANSCRIPT
Singapore Ministry of Education 1997
THINKING SCHOOLSLEARNING NATION
21st Century Competencies FrameworkSingapore Ministry of Education 2011
19 + 28 = 20 + 2719 + 28 = 17 + 3019 + 28 = 50 – 3
150
243
769
8
6 0 1
5 9 8
7 0 1
6 9 8
5 0 1
4 9 8
4 0 1
3 9 8
3 0 1
2 9 8
0 1
9 8
0 1
9 8
0 1
9 8
0 1
9 8
49
23 x 23 = 529
529 – 49 = 480
8 triangles have area of 480 cm2.
The square has an area of 240 cm2 + 49 cm2 = 289 cm2
17 x 17 = 289PQ is 17 cm.