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# SSMOONEY-1st Gr Math

### 1st Grade Math Vocabulary (CCSS)

Term | Definition |
---|---|

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