The Singapore books do not go into what passes for data analysis and probability. I have the Singapore books and they are carefully structured and sequenced. Students have a very good grounding in fractions, adding, subtracting, multiplying and dividing, decimals, percents, ratios, some principles of geometry, and are given very good problem solving techniques using a device known as "bar modeling" which serves as a stalking horse to algebra. Algebraic manipulations are given in the sixth grade, but in the book I have they do not extend it to solving equations. Singapore teaches each topic area to mastery and then builds upon it. I've used it with my daughter and a friend of hers and had very good results. Others on this list have had similar experiences.
Barry Garelick
bonus post!
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