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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.