Tricks Flashcards by Tiffany Advincula | Brainscape

Q

If not sure about percents….

A

part %
——— = ——-
whole 100

Only if “of” isn’t the only word between them.

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Q

Ratio, Rate, Scale

A

Line, line

Cross multiply divide by the other one

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Q

Perimeter of a polygon

A

sum of all sides

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Q

Area of a triangle

A

2

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Q

Area of a square

A

sides squared

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Q

Area of a parallelogram

A

LW or BH

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Q

Area of a circle

A

Pie times radius squared

Radius is always half of diameter

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Q

Circumference of a circle

A

2 times pie time radius or pie times diameter

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Q

Volume of a cube

A

sides cubed

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Q

Volume of a Rectangular Prism

A

LWH

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Q

Interest

A

PRT

P= principal ($)
R= interest (%)
T= time in years T= months
———-
12

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Q

Parallel

A

figures are always the same distance apart

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Q

perpendicular

A

figures cross making a 90 degree angle

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Q

Complementary

A

sum of angles is 90 degrees

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Q

Supplementary

A

sum of angles is 180 degrees

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Q

Sum of interior angles of a triangle

A

180 degrees

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Q

sum of interior angles in a quadrilateral

A

360 degrees

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Q

Commutative Property

A

you can add or subtract in ANY order

ex: AxB = BxA or A + B= B+ A

Q

Associative Property

A

You can group numbers is ANY order

ex: (A+ B) + C= A+ ( B+ C)

Q

Right angle

A

measures exactly 90 degrees

Q

Straight angle

A

measures exactly 180 degrees

Q

acute angle

A

measures less than 90 degrees

Q

obtuse angle

A

measures more than 90 degrees

Q

surface area

A

2LW+ 2LH + 2WH

Q

Percent change

A

original

In decimal form!*

Q

1 cup

A

8 fluid oz.

Q

I pint

A

2 cups

Q

1 quart

A

2 pints

Q

1 gallon

A

4 quarts

Q

1 pound

A

16 oz.

Q

I, He, She, They, we

A

MUST be in front of the verb

Q

Me, Him, Her, Them, Us

A

MUST be after the verb

Q

Union

A

All of them

Q

Intersection

A

Only the common ones

Q

1cm

A

10mm

Q

Proportions

A

cross multiply then divide by the other one

Q

Factors

A

smaller than answer

Q

Multiples

A

larger than answer

Q

Mode

A

the one that occurs the most

Q

Median/Average

A

all numbers add up them divided by how many there is

Q

Mean

A

the one in the middle

Remember to arrange from lowest to highest

Q

Range

A

the big number subtracted by the smallest one

Q

1 kilogram

A

1,000 grams