SAT Math skill
Ratios, percentages, probability, statistics, and reading data: about 15% of SAT Math.
8 articles · newest first
Learn what a fraction means, how to compare and calculate with fractions, and how to catch the denominator mistakes that trip up beginners.
Read articleDrag a single data point and watch the mean chase it while the median holds still. Then use that intuition to answer SAT data questions without heavy arithmetic.
Read articleRaise a price 20%, then cut it 20%, and you do not get back where you started. See why with an interactive slider, then learn the one-multiplier method that handles every SAT percent question.
Read articleMost SAT probability questions come from a two-way table, and most mistakes come from dividing by the wrong total. Click through an interactive table and see exactly which number belongs on the bottom.
Read articleA scatterplot’s line of best fit turns a cloud of points into a prediction. Learn to interpret its slope and intercept in context, make predictions, and avoid the classic causation trap.
Read articleWhich jar of peanut butter is the better deal? How many feet per second is 60 miles per hour? Learn to set up ratios, unit rates, and conversions so the units guide you to the answer.
Read articleA poll says 54% support a proposal, with a margin of error. Does a majority really support it? Change the sample size in an interactive lab and learn the inference rules the SAT tests.
Read articleA class of 10 averages 90 and a class of 30 averages 70. The combined average is not 80. Move the sliders in an interactive lab and learn the sum trick that solves every average question.
Read articlePractice Problem-Solving and Data Analysis
Turn an article into points: practice a few questions on this skill while the idea is fresh.