In their study, The algebraic nature of students’ numerical manipulation in the New Zealand Numeracy
Project, Irwin and Britt (2005) argue that the methods of compensating and equivalence that some
students use in solving number sentences may provide a foundation for algebraic thinking (p. 169).
These authors give as an example the number sentence 47 + 25 which can be transformed into 50 + 22
by ‘adding 3’ to 47 and subtracting 3’ from 25. They claim “that when students apply this strategy to
sensibly solve different numerical problems they disclose an … understanding of the relationships of the
numbers involved. They show, without recourse to literal symbols, that the strategy is generalisable” (p.
171). Several authors, including Stephens (2006) and Carpenter and Franke (2001), refer to the thinking
underpinning this kind of strategy as relational thinking.
In their study, The algebraic nature of students’ numerical manipulation in the New Zealand NumeracyProject, Irwin and Britt (2005) argue that the methods of compensating and equivalence that somestudents use in solving number sentences may provide a foundation for algebraic thinking (p. 169).These authors give as an example the number sentence 47 + 25 which can be transformed into 50 + 22by ‘adding 3’ to 47 and subtracting 3’ from 25. They claim “that when students apply this strategy tosensibly solve different numerical problems they disclose an … understanding of the relationships of thenumbers involved. They show, without recourse to literal symbols, that the strategy is generalisable” (p.171). Several authors, including Stephens (2006) and Carpenter and Franke (2001), refer to the thinkingunderpinning this kind of strategy as relational thinking.
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