Math Review
to calculate the area of a triangle...
1/2 (base x height)
quartile
1/4 of a data set
perpendicular means
a right angle at 90 degrees
to determine the mean...
add all the numbers in the data set and then divide by how many numbers there are, for example: 2, 3, 5, 7, 8 would be 2+3+5+7+8 = 25 and then 25 divided by 2 = 12.5
to calculate the perimeter of a rectangle or square...
add the length of all four sides
when adding and subtracting numbers with decimals...
be sure to line up the decimals vertically, including space values on either side, such as ones, tens, hundreds, tenths, hundredths, etc; then add or subtract as normal, carrying the decimal straight down.
inner quartile range
center 50% of a data set
to reduce a fraction...
divide both the top and bottom numbers by the same number; always reduce your answers
to calculate the area of a trapezoid...
draw lines so that there are only squares, rectangles, or triangles; calculate the area for each shape separately; then add all values together
to add and subtract fractions...
first find a common denominator and then add only the top numbers
gcf
greatest common factor
lcm
least common multiple
to calculate the area of a rectangle or square...
length x width
to calculate the volume of a cube or rectangular prism ...
length x width x height
when multiplying numbers with decimals...
line the numbers up as if there is not decimal present, do the multiplication, then add the decimals at the end (count the total spaces in both numbers)
to determine the mode...
list the numbers in the data set and decide which number occurs most often
to determine the median...
list the numbers in the data set in numerical order and find the number in the middle
to determine the range...
list the numbers of the data set in numerical order and subtract the lowest value from the highest value
when dividing fractions...
multiply by the reciprocol
to multiply fractions...
multiply the top values and then multiply the bottom values
The relationship between sides of a rectangle is that...
opposite sides are equal length
when solving a conversion problem...
set up two equivalent fractions, one with the conversion factor (will usually be given) and the second with the same units on top and bottom as the conversion factor, for example; 12 inches = 1 foot, how many feet in 36 inches.... 12 inches/1 foot = 36 inches / ? feet
when solving a percentage problem...
set up two equivalent fractions, one with the percentage number over 100 and the second with the part over the whole,
recirprocol
when a fraction is flipped upside down
The height of a triangle is found...
where a line is drawn perpendicular to the base.
