SAT Subject Test Mathematics Level 1
One way to compare fractions is to re-express them with a common denominator. and is greater than ...
PERCENTS The key to solving most fraction and percent word problems is to identify the part and the whole. Us ...
RATIOS, PROPORTIONS, AND RATES 30 . Finding the Original Whole To find the original whole before a percent ...
sum of the numbers. If the ratio of males to females is 1 to 2, then the males-to-people ratio is and ...
AVERAGES Average rate is not simply the average of the rates. To find the average speed for 120 miles at 40 mph ...
39 . Using the Average to Find the Sum Sum = (Average) × (Number of terms) If the average of 10 numbers is 5 ...
POSSIBILITIES AND PROBABILITY POWERS AND ROOTS 42 . Counting the Possibilities The fundamental counting principle: ...
45 . Raising Powers to Powers To raise a power to a power, multiply the exponents: (x^3 )^4 = x3×4 = ...
ABSOLUTE VALUE ALGEBRAIC EXPRESSIONS 49 . Negative Exponent and Rational Exponent To find the value of a ...
To combine like terms, keep the variable part unchanged while adding or subtracting the coefficients: 2 a + ...
FACTORING ALGEBRAIC EXPRESSIONS each term in the first polynomial by each term in the second. After mult ...
Recognize polynomials that are squares of binomials: For example, 4 x^2 + 12x + 9 factors to (2x + 3)^2 , a ...
SOLVING EQUATIONS 62 . Solving a Linear Equation To solve an equation, do whatever is necessary to both s ...
is to write a system of equations–one equation for each set of information. Use variables that relate ...
FUNCTIONS To solve an inequality, do whatever is necessary to both sides to isolate the variable. Just re ...
COORDINATE GEOMETRY 71 . Domain and Range of a Function The domain of a function is the set of values for wh ...
To find the distance between R(3,6) and S(5,−2): 73 . Using Two Points to Find the Slope The slope of the l ...
LINES AND ANGLES The slope is 75 . Using an Equation to Find an Intercept To find the y-intercept, yo ...
In the figure above, the angles marked a° and b° are adjacent and supplementary, so a + b = 180. Furtherm ...
TRIANGLES—GENERAL 79 . Interior and Exterior Angles of a Triangle The three angles of any triangle add up t ...
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