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40 Cards in this Set
- Front
- Back
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complementary
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sum of angle measures = 90 deg
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supplementary
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sum of angle measures = 180 deg
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congruent
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are equal, the same.
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Equation for figuring out how much money a person or store makes when selling something & its three variables defintiion?
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R = P - C
Revenue (how much you keep) = Price (how much it is sold for) - Cost (how much it cost you) |
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equation for total dollars collected (also known as total revenue or sales) =
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Revenue or Sales $ = numbers sold * price per unit
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obtuse angle def
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> 90 deg and
< 180 deg |
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acute angle
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< 90 deg
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fraction multiplication rule
1/h * t = |
1/h * t = t/h
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3 ways of showing muliplication
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x
dot, * 3t |
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what are recipies for math you need to know well to make problems easy?
2 reasons why? |
Equations
1. equations, simpler, more precise & quicker than writing explanation words 2. it avoids easy mistakes. |
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If your having difficulties with a problem, or before a homework assignment, what should you do?
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Review the problems principles and formulas in the text book and your class notes.
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What important principle about equation variables (letters) can help you solve problems?
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letters can be replaced or substituted by their equation "equals".
For example: a = b + 9 b = 2a + 5 b can be substituted into above equation: a = (2a+5)+9 now, equation can be solved for a = |
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What 3 important principles about equations allow you to solve problems?
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1. you can substitute for variables
2. you can add or subtract each side of the equals sign by the same amount (to keep ballanced) in order to get to "x =" type solutions. 3. you can multiply each side of the equals sign by the same amount (to keep ballanced) in order to get to "x =" type solutions. |
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A number is divisible by 2 if
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the ones digit is 0, 2, 4, 6 or 8
like 136 Even numbers are divisble by 2 |
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A number is divisible by 5
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the ones digit is 0 or 5
like 15 |
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A number is divisible by 10
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the ones digit is 0
like 90 |
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A number is divisible by 3
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if the sum of the digits is divisible by 3.
like 432 = 9 |
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A number is divisible by 6
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if the number is divisble by 2 and 3.
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A number is divisible by 4
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if the last two digits are divisible by 4.
e.g. 88 --------------- or, take the nuber & divide it in half. If it is even than it is divisible by 4. |
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A number is divisible by 9
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if the sum of the digits is divisible by 9.
729 = 18 |
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definition & formula of mean (average) =
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average = add the values & divide by the number of values.
average = mean = sum / number of values n |
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A number is divisible by 7
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multiple the last number by 2 and then subtract the it from the other numbers. If divisible by 7 so is the original number.
e.g. 455: 5*2; 45-10 = 35 which is divisble by 7. |
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what is 66 cents in $ decimal form?
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$0.66
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what is 1 cent in $ decimal form?
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$0.01
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what is 8 cents in $ decimal form?
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$0.08
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definition of mode
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mode = the number that appears most frequently in a set of numbers.
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mode of 2 4 4 4 5 7 7 ?
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4
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definition of median
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the middle number in a set of ordered numbers.
for an even number of numbers, the median is the number halfway between the two middle numbers |
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what is median of
12 26 34 47 52 |
34
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what is median of
8 8 12 14 20 21 |
13
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definition of range
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the difference between the greatest & least number in a set
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what is an outlier
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a number or numbers whose values are much less or much greater than the other numbers in a data set.
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definition of hypothesis
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a statement used as the basis of an investigation or experiment to test it right or wrong.
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formula for circumference of a circle:
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c = 2 pi r = pi d
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d = diameter =
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2r
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What is the most important 7 mandatory habits in solving math problems?
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1. Read & understand the problem and instructions carefully.
2. Disciplined, focused attention to details! 3. Write down any equations or formulas that may apply to the problem: Standard memorized, Text book lesson equations or, Deduced from the problem statement. 4. Draw a picture & play with it until it correctly represents the problem and/or the equations. 5. BE NEAT WITH ENOUGH SPACE AND spread out COLUMNS IN-LINE. Dark main calculation numbers. Addition carries directly above column so not confused as borrowed digit. 6. Check your work (is much easier with neatness); check your work with estimates & quick rounding. 7. Label your answer & point to it with an arrow. |
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Negative multiplied by a Negative is _____
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positive
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negative times positive is a ______
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negative
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What is single the most important habit when solving math problems or you will get it wrong?
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Discliplined attention to details: never let yourself get lazy with math!
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Constant Pi =
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3.14
(approximately 3) |
