Math · Quick guide
SAT percentages: find the right base
Percent change = (new amount − original amount) ÷ original amount × 100%. Each successive percent acts on the amount at that step.
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Math · Quick guide
SAT linear functions: rate and starting amount
In y = mx + b, m is the change in y for each one-unit increase in x; b is the value of y when x = 0. Include the units.
Reading and Writing · Quick guide
SAT punctuation: join complete sentences
Two independent clauses can be joined with a period, a semicolon, or a comma plus a coordinating conjunction such as and or but. A comma alone is not enough.
Math · Quick guide
SAT circles: distinguish radius, area, and distance
The diameter is twice the radius. Circumference is 2πr, a distance around the circle. Area is πr², a measure of the region inside.
Reading and Writing · Quick guide
SAT Words in Context: let the passage choose the meaning
Choose the meaning that fits what the word does in this passage. Read the surrounding details, then substitute your choice back into the sentence.
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