Thursday, March 29, 2012

Math problems of the week: 2nd grade Investigations vs. Singapore Math

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?

1 comment:

Barry Garelick said...

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.