APRIL 2015 SAT Math Facts
Week of April 13
April 13 – Whenever you see the word “distinct”, replace it with the word different.
April 14 – Consecutive numbers are numbers in order. Ex. 1,2,3…. * Sometimes questions call
for consecutive even (2, 4, 6…) or consecutive odd (1, 3, 5…)
April 15 – Rules of “0”. Zero is neither positive nor negative. Zero is even. Zero is an integer and
a digit.
April 16 – The union (denoted by “U”) of two sets is a set containing all of those elements in
both sets. Ex. A = {4, 5, 7, 8} B= {3, 7, 13, 15,} A U B = {3, 4, 5, 7, 8, 13, 15}
April 17 – The intersection (denoted by “∩”) of two sets is a set containing all of those elements
that both sets have in common.
Ex. A = { 9, 10 , 17, 22, 36, 45} B = { 5, 9, 11, 12, 13, 36 } A ∩ B = { 9, 36}
Week of April 20
April 20 – The length of arc and the area of a sector of a circle are proportional to the measure
of the degree of its central angle.
April 21 – The domain is the your input ( the set of all possible “X” values).
April 22 – The range is considered to be the difference between the highest and lowest values
in a data set. When dealing with functions or graphs, the range is your output (the set of all
possible “Y” values).
April 23 – The word inclusive is an indication that the boundaries of a range of numbers should
be included in the data. If the question asks you to consider a range between two values and
does not say inclusive, do not include the boundaries in your data.
April 24 – In similar figures, corresponding angles are congruent and corresponding sides are in
proportion.
Week of April 27
April 27 – A remainder is the WHOLE number left over after dividing. The decimal or fractional
equivalent cannot be used.
April 28 – The altitude is the height. An altitude has to be perpendicular (90 degrees) to the side
that it strikes.
April 29 – If two units are directly proportional it is the same as setting up a proportion. The
following formula should be used:

𝑥1
𝑦1
=
𝑥2
𝑦2
Sometimes values may need to be raised to a power or have a root taken from them.
April 30 – If two units are indirectly proportional, the following formula should be used:
𝑥1 𝑦1 = 𝑥2 𝑦2

Sometimes values may need to be raised to a power or have a root taken from them.