**I. The second-to-last coin problem in the 4th grade Investigations Student Activity Book, Unit 9, "Penny Jars and Plant Growth"**, p. 66 [click to enlarge]:

**II. The final coin problem in the Singapore Math**, p. 163 [click to enlarge]:

*Primary Mathematics 4B Workbook*. Review II
## 1 comment:

The investigations one is introducing linear graphs. The Singapore one is for probability or outcome trees. The two examples are not really related. I think they are addressing different concepts.

Plus, the Singapore example is from the standards edition, and probability was added to that just to meet the standards in California. In Singapore they don't teach that until secondary level. However, the material that was added does seem to be in keeping with the general level of expectation that students really are capable of thinking.

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