References
- 1977 . Mathematics, Science and Modern Languages in Maintained Schools in England , London : HMSO .
- 1980 . Mathematics across the Curriculum, PME 233, Unit 1 ‐ Introduction , 21 – 25 . Milton Keynes : Open University Press .
- Ibid., Unit 8 ‐ Finishing Off, p. 21.
- Ibid., Unit 10 ‐ Seeking out Relationships
- 1982 . Developing Mathematical Thinking, EM 235, Topic 5 ‐ Vulgar and Improper , 71 Milton Keynes : Open University Press .
- Ibid., Topic 1 ‐ Subtraction, p. 32.
- Ibid., Topic 3 ‐ Measuring, p. 37.
- 1981 . Calculators in the Primary School , 21 Milton Keynes : Open University Press .