Chapter 3 covers the basics to get started with your NXT brain.  Although you will won't really be touching the NXT until Chapter 6 you might as well learn the following skills:

Let's cover some FRACTIONS from sums.co.uk:  http://www.sums.co.uk/playground/n6a/playground.htm

Let's learn how to convert FRACTIONS to DECIMALS:  http://www.amblesideprimary.com/ambleweb/mentalmaths/fracto.html

Let's learn about how all this relates to PERCENTAGES:  http://www.freewebs.com/weddell/FDP%20contents.html

Let's learn about BAR CHARTING so we can see how it can help us visualize number comparisons:  http://www.amblesideprimary.com/ambleweb/mentalmaths/grapher.html

Let's learn PROBABILITY:  http://www.bbc.co.uk/education/mathsfile/shockwave/games/fish.html

Let's learn about MEAN, MEDIAN, and MODE:  http://www.bbc.co.uk/education/mathsfile/shockwave/games/train.html




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MATH:
Standard 11: Data Analysis, Statistics, and Probability: FLUENCY WITH DATA:
Pose questions and collect, organize, and represent data to answer those
questions
Standard 13: Data Analysis, Statistics, and Probability: DATA ANALYSIS:
Develop and evaluate inferences, predictions, and arguments that are based on
data