mathvocabulary
TRANSCRIPT
MATHMATHVOCABULARYVOCABULARY
MATHMATHVOCABULARYVOCABULARY
7/12/2012 Source: teachers.rmcity.org
calculate• Perform (do) an operation
(+,-,x,÷)
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operationDescribes any of these: – ADDITION– SUBTRACTION– MULTIPLICATION– DIVISION
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evaluate
• To find the value of something.– Value is what something is worth.
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identical …exactly the same.
…worth the same amount. …has equal value.
5 + 5 = 6 + 4
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standard form• A number as we are used to
seeing it in everyday life…• Examples are:
– 24– 765– 8,758,215… etc.
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expanded form• A number written out to show the
place value of each of its digits.• Examples:
– 20 + 4 – 700 + 60 + 5– 8,000,000 + 700,000 + 50,000 +
8,000 + 200 + 10 + 5
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word form• A number written out in words.• Examples:
– twenty-four– seven hundred sixty-five– eight million, seven hundred fifty-
eight thousand, two hundred fifteen
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natural numbers• Also called whole numbers.• These are the numbers we use to
count things.
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digit• One of the TEN symbols that are
used to write numbers.• 0,1,2,3,4,5,6,7,8 and 9• “0” is a DIGIT, not a NUMBER!
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place value• The value of a digit that is based
on it’s position in a number.• Example:
– In the number “674”, the 7 is in the tens place, so it’s place value is 70.
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period• A number is divided into groups of
three, starting from the right and each separated by a comma. These groups are called periods.
• Example:– The number 127,453,989 has THREE
periods.
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inequality• A statement that one quantity (also
called “amount”) is greater than or less than another.
• Uses the symbols: Greater than > Less than <**Remember that when you read these
symbols from the left to the right, the open end is open to the bigger quantity, no matter how you look at it.
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infinite• Goes on and on FOREVER • Doesn’t end
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line• A type of curve that is straight. • It extends INFINITELY in both
directions.
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line segment • The part of a line between two
points, called endpoints.
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ray• A straight curve that has exactly
ONE ENDPOINT. • Then it extends INFINITELY in one
direction.
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round number• A natural number ending in one or
more zeros.– Examples include:
• 20• 300,000• 100• 7,000,000
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approximate value• A value that is close to, but not
exactly, the real value. • Approximate value is easier to
work with than real value.• Example:
– 750,000 is an approximate value for the real value of 748,362.
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exact• The actual amount, the real value.• Example:
– The exact amount of students in this school is 639.
– What would be the approximate amount?
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estimate• To find a number that may not be
the exact answer to a question, but is close enough.
• We say, then, that it is an estimate of the exact value.– Which is an example of an estimate?
Exact or approximate value?
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polygon• a shape in the plane with the following
properties:– the boundary of the shape is a piecewise
linear curve– the boundary is closed– the boundary does not intersect itselfExamples include:
triangle, rectangle, pentagon, trapezoid…
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vertex• two meanings:
– Vertex of a POLYGON: the common POINT of two sides of a polygon.
– Vertex of an angle: the common ENDPOINT of two rays that form the sides of an angle.
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perimeter• The length of a boundary of a
shape in a plane.• The SUM of the sides of a polygon!• 3cm+3cm+3cm+3cm+3cm+3cm+3cm+3cm
= 24 cm3 cm
3 cm
3 cm3 cm
3 cm
3 cm
3 cm
3 cm
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compatible numbers• Add together to make a round number (a
number that ends in zero). • Example:
17 and 3 are compatible because when you add them, the answer is 20. (20 is a round number)
• Non-Example:– 24 and 5 are NOTcompatible because when you
add them, the answer is 29. (29 is not round)
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Commutative Property(of Addition)
• When adding numbers, the order of the addition does not matter.
2 + 3 = 3 + 2
**You can move the numbers around, just like people commute…
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Associative Property(of Addition)
• When adding numbers, it doesn’t matter which ones you group together to do the addition.
(5 + 2) + 8 = 5 + (2 + 8)
**Associates are friends, so think about groups of friends…
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sum• The answer to an addition
problem.
• Example: 5 + 3 = 8
8 is the sum.
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summand• The numbers you are adding
together in an addition problem.
5 + 3 = 8 5 and 3 are the summands.
*same thing as “addends”
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convenient addition• Convenient means “easy”.• So, convenient addition is the
process of using compatible numbers, the Commutative Property and the Associative Property to make your addition easier and quicker.
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inverse• Means “opposite”• Subtraction is the INVERSE
operation to addition • Division is the INVERSE operation
to multiplication
15 18
+3
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subtraction• An operation that means finding a
missing summand, given the sum and the other summand…
2 + __ = 5 …to solve it, use 5 – 2 = __
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difference• The answer to a subtraction
problem.
5 – 2 = 3
3 is the difference between 5 and 2
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subtrahend and minuend
• minuend – subtrahend = difference• Minuend is the number you start
with… • Subtrahend is the number you
subtract…5 – 2 = 3
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parentheses• A set of two symbols that indicate what
operation to do first in a mathematical expression.
you have to have the opening side ( … & the closing side )
it matters where they are:7 – ( 5 – 1 ) = 7 – 4 = 3( 7 – 5 ) – 1 = 2 – 1 = 1
and there can be more than one set in an expression:
8 – (20 – (9 + 6)) = 8 – (20 – 15) = 8 – 5 = 3
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numerical expression• A mathematically meaningful sequence
of numbers, operation signs and parentheses.
5 + (9 – 2)
Numerical expressions tell us what operations to do FIRST, SECOND… etc.
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algebraic expression• A mathematically meaningful sequence of
numbers, letters that stand for numbers, operation signs and parentheses.
3 + (a – 4)
We can replace that “a” with any number we want to… it’s called a VARIABLE because it can change. Any letter can be a variable.
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multiplication• Multiplication is adding up several summands,
each equal to the same number.• Example: 3 + 3 + 3 + 3 = 3 · 4• There are two different ways to show
multiplication of numbers by themselves: 3 X 4 and 3 · 4
two more ways using letters and/or numbers:3 · a = 3a and a · b = ab
AND a way to show it with parentheses:3 · (5 + a) = 3(5 + a)
When there is addition or subtraction AND multiplication in the same expression with NO parentheses… do the
multiplication FIRST! 7/12/2012 Source: teachers.rmcity.org
factors• The numbers we multiply together.
3·4 = 123 and 4 are factors of 12
7·(6+4) = 707 and (6+4) are factors
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product • The result of multiplication.
3 · 4 = 1212 is the product of 3 times 4
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Commutative Property of Multiplication
• The product of two numbers does not change if we swap (change the order) of the factors…
m · n = n · m3 · 4 = 4 · 3
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Associative Property of Multiplication
• Changing the grouping of the factors does not change the product…
(a · b) · c = a · (b · c)(3 · 4) · 2 = 3 · (4 · 2)
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Zero Property of Multiplication
• The product of any number and zero is zero.
0 · n = 0n · 0 = 0
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One (Identity) Property of Multiplication
• The product of any number and 1 is that number…
4 · 1 = 1+1+1+1 = 4n · 1 = n1 · n = n
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exponent• The “little” number in the following
expression:5³
… which means that we need to take 5 and multiply it by itself 3 times
5 x 5 x 5 = 125…it is also called a “power”
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protractor• An instrument used to measure
angles.
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degree• The unit used to measure angles. • Usually written as a small circle in
the superscript after a number:Example: 60°
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right angle• An angle measuring exactly 90°
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obtuse angle• Any angle that is larger than 90°
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acute angle• Any angle that is less than 90°
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intersecting lines• Lines that cross.• The point where they cross is
called the point of intersection.
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parallel lines• Two lines that will never cross. • They stay the same distance apart
forever.
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perpendicular lines• Two lines that meet to form right
(90°) angles.
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dividend• The number that is being divided
A ÷ B = C
A is the dividend
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divisor• The number we are dividing by
A ÷ B = C
B is the divisor
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quotient• The result of division
A ÷ B = C
C is the quotient
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remainder• The number left over after the
divisor has gone into the dividend as many times as it can.
7 ÷ 3 = 2 R 1…because 3 goes into 7 two times
and has one leftover
7/12/2012 Source: teachers.rmcity.org
area• The measure of the total amount
of surface on a plane that an object takes up.
• We use “square” units to measure area
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vertical• UP and DOWN• Goes from top to bottom in a
straight line.
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horizontal• Goes side to side, from left to right
or right to left in a straight line.
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coordinate grid
(x, y)(Over, Up)
*walk the ladder OVER to the spot, then
climb UP the ladder*
ordered pair
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bar graph
Single bar Double bar
- Shows data that tells how many or how much
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line graph• shows change over time
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circle graph• shows a part-whole relationship
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pictograph
• Uses pictures or symbols to represent amounts
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prime• Having EXACTLY two factors• Those factors are 1 and itself Examples:
5 7 23 51 113…
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composite• Has MORE THAN two factors…
Examples: 4 12 24 27 56 144 169
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Greatest Common Factor (GCF)
• the GCF of a group of numbers is the greatest natural number that divides (is a factor of) each of the numbers in the group (common).
• The GCF of 8 and 12 is the factor 4 because it is the biggest number that both of them can be divided by.
7/12/2012 Source: teachers.rmcity.org
Least Common Multiple (LCM)
• The smallest number that is divisible by both numbers in question.
• Example: the LCM of 6 and 9List the first 9 multiples of each number:
6: 6, 12, 18, 24, 30, 36, 42, 48, 549: 9, 18, 27, 36, 45, 54, 63, 72, 81
– Then look for the least number that is listed under both… so, 18 is the LCM of 6 and 9
7/12/2012 Source: teachers.rmcity.org
fraction• A collection of several equal parts
into which a whole is divided. • A fraction always divides a whole
into EQUAL PARTS.
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numerator• The number on top of a fraction… • Represents the number of equal
parts making up the fraction. 34
3 is the NUMERATOR.
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denominator• The number on the bottom of a
fraction. • Represents the TOTAL number of equal
parts into which the whole is divided.34
4 is the DENOMINATOR.
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decimal• A fraction with a denominator that is a
power of 10.• It is written with a decimal point that
separates the whole part from the fractional part.
Examples: 0.30.670.258
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equivalent fractions• When you multiply or divide BOTH
the numerator and denominator of a fraction by the SAME number, you generate equivalent fractions.
• They are worth the same amount, but they appear different.
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simplest form of a fraction
• When the GCF of the numerator and denominator is 1.
• To find Simplest Form, simply find the GCF of the numerator and denominator, then divide them both by that number.
7/12/2012 Source: teachers.rmcity.org
improper fraction• A fraction where the numerator is
greater than or equal to the denominator.
• all improper fractions are greater than or equal to one whole.
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mixed number• A way of writing numbers that is
the sum of a whole number and a fraction.
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volume
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median
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mode
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range
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