Two approaches to subtraction practice:
I. A 2nd grade Investigations sheet, from mid-way through the 2nd grade curriculum, Putting Together and Taking Apart, p. 135 [click to enlarge]:
II. A subtraction exercise from early on in the 2nd grade Singapore Math Curriculum, Primary Mathematics 2A, p. 35 [click to enlarge]:
III. Extra Credit:
1. Map the assignment to the teaching protocol:
a. Telling you which strategy to use
b. Providing feedback about whether your answer is correct
2. Which assignment is more Constructivist?
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1 comment:
My vote is that Investigations is the more constructivist of the two. Given that students may not know that "how far is it?" means "subtraction", I'd say there's quite a bit of discovery that has to happen here, which probably doesn't happen.
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