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84 terms

4th grade Math

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counting numbers
all the numbers in the sequence 1, 2, 3, 4, and so on
sequence
a following of one thing after another in time
term
a number, a variable, or the product of a number and a variable
whole numbers
counting numbers and zero
digits
the symbols used to write numbers: 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9
community property of addition
a+b=b+a
addends
numbers that are added together
expanded form
the form of a number that shows the value of each digit;
Ex. 300,000+40,000+5,000+700+20
difference
the answer to a subtraction problem
inverse operation
Opposite operations that undo each other; add and subtract or multiply and divide
fact family
A group of three numbers related by addition and subtraction or by multiplication and division.
ordinal numbers
numbers that describe position or order (first, second . . .)
identity property of addition
Adding zero to any number will not change the number. Example: 6 + 0 = 6.
algorithm
a step-by-step procedure for solving a problem
even
a whole number that is divisible by 2
odd
a whole number that is not divisible by two
integers
Positive and Negative Whole Numbers and 0. Examples: .... -3, -2, -1, 0, 1, 2, 3.....(Does not include fractions or decimals)
equation
A mathematical sentence that contains an equals sign.
geometry
mathematics dealing with lines, angles, surfaces, and solids
point
an exact position
line
a straight collections of points extending in opposite directions without end
line segment
part of a line with two endpoints
ray
(mathematics) a straight line extending from a point
horizontal
Going straight across from side to side
vertical
upright; perpendicular to horizontal
oblique
slanted or sloping; not horizontal or vertical
number line
A line for representing and graphing numbers. Eachpoint on the line corresponds to a number.
negative numbers
numbers less than zero and to the left of zero on a number line
tally marks
small marks used for counting with the largest group being a group of five
multiples
Products that result from multiplying the number by each of the whole numbers. Ex) 6: 6, 12, 18, 24, 30, 36...
factors
Numbers that are multiplied together to get a product
product
a quantity obtained by multiplication
communitive property
States you can add or multiply in any order
property of zero for multiplication
zero times any number is zero
identity property of multiplication
the product of any number and 1 is equal to the original number (a x 1 = a)
division
an arithmetic operation that is the inverse of multiplication
dividend
the number being divided
quotient
the answer to a division problem
fraction
part of a whole
denominator
the bottom number in a fraction, the part of a fraction below the line, which tells how many equal parts there are in the whole or in the group.
numerator
the part of a fraction above the line, which tells how many parts are being counted.
division algorithm
This is the method for solving division problems with the following steps: divide, multiply, subtract, bring down (26)
a.m.
ante meridiem, before noon
p.m.
after noon, post meridiem
century
a period of 100 years
scale
a type of number line used for measuring
Celsius
Metric unit for measuring temperature; On this scale water freezes at zero and boils at 100.
Fahrenheit
A temperature scale with the freezing point of water 32 degrees and the boiling point of 212 degrees is also known as,
leap year
a year in which an extra day is added to the calendar, year that has an extra day; occurs every fourth year
common year
A year with 365 days
decade
a period of 10 years
millenium
a period of one thousand years
percent
A ratio that compares a number to 100
intersect
to cross
parallel lines
lines that never intersect
perpendicular
intersect and form right angles
angle
opening between intersecting lines or segments
right angle
like a corner of a square
acute angle
angle with opening less than right angle
obtuse angle
angle with oppening greater than right angle
straight angle
angle open to form a straight line
plane
flat surface that extends without end
polygons
a closed figure, all straight lines, and no intersecting lines
vertex
A point where two or more straight lines meet.
sides
sideslines segments on a polygon
quadrilateral
a four-sided polygon
congruent
having the same size and shape
similar
having the same or similar characteristics
exact numbers
numbers which always have the same value regardless of who measures them
round numbers
refers to numbers ending with one or more zeros
elapsed time
is the amount of time between two points in time
acute triangle
a triangle with 3 acute angles
obtuse triangle
a triangle that contains an obtuse interior angle
right triangle
a triangle with one right angle
equilateral triangle
a triangle with three congruent sides
isoceles triangle
a triangle that has at least 2 congruent sides
scalene triangle
a triangle with no congruent sides
mixed numbers
A whole number and a fraction together.
degrees
a unit for measuring angles
protractor
an instrument for drawing/measuring angles
common denominators
Denominators that are the same
international system of units
A REVISED VERSION OF THE METRIC SYSTEM
metric system
the basic unitof length in the metricsystemis a meter
U.S. Customary System
Units in the U.S.Customary System are not related by the number 10