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SSMOONEY-1st Gr Math

1st Grade Math Vocabulary (CCSS)

TermDefinition
add To combine; put together two or more quantities.
addend Any number being added.
additive identity property of 0 Adding zero to a number gives a sum identical to the given number.
alike Same size, quantity, or amount.
analog clock A clock that shows the time by the positions of the hour and minute hand.
associative property of addition Changing the grouping of 3 or more addends does not change the sum.
attribute A characteristic of an object, such as color, shape, size, etc.
bar graph A graph that uses height or length of rectangles to compare data.
bar model A model that uses bars to represent known and unknown quantities and the relationship between these quantities.
category A collection of things sharing a common attribute.
circle A closed shape with no sides and no vertices.
closed shape A shape with all the sides connected.
column A vertical arrangement of numbers or information in an array or table.
commutative property of addition Changing the order of the addends does not change the sum.
compare To decide if one number is greater than, less than, or equal to another number.
compose To put together smaller numbers to make larger numbers.
composite shape A shape that is made from 2 or more geometric shapes.
cone A solid shape with a circular base, a curved surface, and one vertex.
count back A way to subtract.
count on A way to add.
count up A way to subtract. Finding the difference by adding up from the smaller number to the larger number.
cube A solid shape with 6 square faces.
curved surface A rounded surface.
cylinder A solid shape with 2 circular bases and a curved surface.
data A collection of information.
date A given month, day, and year.
day There are 24 hours in a day.
decompose To separate a number or shape into 2 or more parts.
difference The result when one number is subtracted from another.
different Compare 2 or more objects or figures to find what is not the same.
digit Any of the symbols 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9.
digital clock A clock that shows the time with numbers of hours and minutes; usually separated by a colon. (:)
doubles Addition facts with two addends that are the same.
doubles minus 1 An addition fact with a double to add and then subtract one.
doubles plus 1 An addition fact with a double to add and then add one.
equal Having the same amount.
equal parts Parts of an object or group that have been divided equally into pieces. (also known as equal shares)
equal shares Parts of an object or group that have been divided equally into pieces. (also known as equal parts)
equal sign A symbol showing that one amount is the same as another. (also known as is the same as)
equation A number sentence with an equal sign. The amount on one side of the equal sign has the same value as the amount on the other side.
expression A mathematical phrase without an equal sign.
face A flat surface on a solid shape.
fact family A group of related facts that use the same numbers. (also known as related facts)
false Not true; incorrect. A false equation does not have the same value on each side of the equal sign.
fewer Smaller quantity or amount.
fewest A word used when comparing three or more groups of objects.
flat surface A surface that is not curved.
fourth of One of 4 equal parts.
fourths The parts you get when you divide something into 4 equal parts.
greater than Greater than is used to compare two numbers when the first number is larger than the second number.
half-circle Half of a circle.
half hour A unit of time equal to 30 minutes.
half of One of 2 equal parts.
half past 30 minutes after the hour.
halves The parts you get when you divide something into 2 equal parts.
hexagon A shape with 6 straight sides and 6 vertices.
hour A unit of time equal to 60 minutes.
hour hand A short hand on a clock.
hundred A number equal to 10 tens or 100 ones.
is the same as The meaning of the equal sign. Having the same amount on each side of the equal sign. (also known as equal)
length How long something is. The distance from one point to another.
less than Less than is used to compare two numbers when the first number is smaller than the second number.
longer A word used when comparing the length of two objects.
longest A word used when ordering three or more objects by length.
making ten A strategy that uses combinations of numbers that add up to ten.
measure To find a number that shows the size or quantity of something.
minus A symbol that shows subtraction; take away a quantity.
minute A unit of time equal to 60 seconds.
minute hand The long hand on a clock.
more Greater quantity or amount.
more than More than can be used to describe an action to mentally add 10 more to a given number.
most A word used when comparing three or more groups of objects.
number A number indicates how many or how much.
number line A diagram that represents numbers as points on a line.
numeral A symbol used to represent a number.
object A material thing that can be seen and touched.
ones A single unit or object.
order A sequence or arrangement of things.
partition Describes an action to divide shapes into smaller parts.
picture graph A graph that uses pictures or symbols to show data.
place value The value a digit has because of its place in a number.
plus A symbol that shows addition; combine; put together two or more quantities.
quarter-circle A fourth of a circle.
quarter of One of 4 equal parts.
quarters Four equal parts or shares.
rectangle A shape with 4 sides and 4 square vertices.
rectangular prism A rectangular three-dimensional shape.
related facts Addition and subtraction facts that share the same numbers. (also known as fact family)
rhombus A two-dimensional figure with all 4 sides equal in length.
row A horizontal arrangement of numbers or information in an array or table.
shorter A word used when comparing the length of two objects.
shortest A word used when comparing three or more objects in length.
side One of the line segments that makes a flat, two-dimensional shape.
solid shape A shape that is not flat; an object that has three dimensions. (i.e., height, length, and width)
sort To group or organize according to shared attributes.
sphere A solid shape with a curved surface.
square A shape with 4 sides that are the same length and 4 right angles.
subtract Take away, remove,or compare.
sum The answer to an addition problem.
take away To subtract.
taller A word used when comparing the height of two objects.
tallest A word used when ordering three or more objects by height.
tally chart A chart that uses tally marks to record data
tally mark A mark that shows a number or quantity. A tally shows one. A line through four tallies shows five.
ten A group of ten ones. One more than nine; one less than eleven.
tens Sets of ten ones. (i.e., 10, 20, 30, 40, 50, 60, 70, 80, or 90)
three-dimensional shape A solid shape that has length, width, and height.
trapezoid A 4-sided two-dimensional shape that has exactly one pair of parallel sides.
triangle A shape with 3 straight sides and 3 vertices.
true Accurate; correct. A true equation has the same value on each side of the equal sign.
two-dimensional shape A plane, flat shape that has length and width.
unequal parts Parts of a whole that are not the same size.
unequal shares Parts of a whole that are not the same size.
vertex (plural - vertices) A corner of a shape. (plural - vertices)
whole All of an object, a group of objects, shape, or quantity.
zero A whole number that tells there are no objects in a set.
unit What is used to measure the height or length of an object.
Created by: ssmooney