Math vocabulary words and their definitions will be listed on this page.
I encourage you to use this page to help your child study their
math vocabulary words!
I encourage you to use this page to help your child study their
math vocabulary words!
Chapter 1: Addition Concepts:
- add: To join together sets to find the total or sum. Another word is compose.
- addition number sentence: An expression using numbers and the + and = signs.
- equals (=): Having the same value as or is the same as.
- false: Something that is not a fact. The opposite of true.
- part: One of the parts joined when adding.
- plus (+): The sign used to show addition.
- sum: The answer to an addition problem.
- true: Something that is a fact. The opposite of false.
- whole: The entire amount of an object.
- zero: The number zero equals none or nothing.
Chapter 2: Subtraction Concepts:
- compare: look at groups of objects, shapes, or numbers and see how they are alike or different.
- difference: the answer to a subtraction problem.
- minus (-): the sign used to show subtraction.
- related facts: basic facts using the same numbers.
- subtract: to take away. Another word is decompose.
- subtraction number sentence: an expression using numbers and the - and = signs.
Chapter 3: Addition Strategies to 20:
- addends: any numbers being added together.
- count on: on a number line, start with the greater number and count up.
- doubles: two addends that are the same.
- doubles minus 1: add with doubles and subtract (take away) one.
- doubles plus 1: add with doubles and add one.
- number line: a line with number labels.
Chapter 4: Subtraction Strategies to 20:
- count back: on a number line, start at the greater number and count back.
- fact family: addition and subtraction sentences that use the same numbers.
- missing addend: you can use subtraction facts to find a missing addend.
Chapter 5: Place Value:
- equal to (=): is the same as.
- great than (>): the number or group with more.
- hundred: 100 ones or 10 tens
- less than (<): the number or group with fewer.
- ones: the numbers in the range of 0 to 9.
- regroup: take apart a number to write it in a new way.
- tens: the number in the range of 10 to 99
Chapter 6: Two-Digit Addition and Subtraction:
- add: to join together sets to find the total or sum.
- subtract: to take away.
- sum: the answer to an addition problem.
- difference: the answer to a subtraction problem.
- ones: the numbers in the range of 0 to 9.
Chapter 7: Organize and Use Graphs:
- bar graph: a graph that uses bars to show data.
- data: numbers or pictures collected to show information.
- graph: a way to present data collected; also a type of chart.
- picture graph: a graph that has different pictures to show data.
- survey: to collect data by asking people the same question.
- tally chart: a chart that shows a mark for each vote in a survey.
Chapter 8: Measurement and Time:
- analog clock: a clock that uses an hour hand, a minute hand, and numbers to show time.
- digital clock: a clock that uses only numbers to show time.
- hour: a unit to measure time. 1 hour = 60 minutes.
- half hour: one half of an hour is equal to 30 minutes. It is sometimes called half past or half past the hour.
- hour hand: the hand on an analog clock that tells time to the hour. It is the shorter hand.
- length: a measure that tells how long something is.
- long: a way to compare the lengths of two (or more) objects.
- measure: to find the length of an object using standard or nonstandard units.
- minute: a unit to measure time. 1 minute = 60 seconds.
- minute hand: the hand on an analog clock that tells the minutes. It is the longer hand.
- o'clock: a word used to tell time. It describes the position of the minute hand at the beginning of the hour.
- short: a way to describe the length of two (or more) objects.
- unit: an object used to measure.
Chapter 9: Two-Dimensional Shapes and Equal Shares:
- circle: a closed round shape.
- composite shape: a new shape made from putting together other shapes.
- equal parts: each part is the same size.
- fourths: four equal parts of a whole. Each part is a fourth, or a quarter of the whole.
- halves: two equal parts of a whole. Each part is a half of the whole.
- rectangle: a shape with four sides and four corners.
- side: part of a shape.
- square: a rectangle that has four equal sides.
- trapezoid: a four-sided plane shape with only two opposite sides that are parallel.
- triangle: a shape with three sides.
- two-dimensional shape: the outline of a shape such as a triangle, square, or rectangle.
- vertex: a corner of a shape.
- whole: the entire amount of an object.
Chapter 10: Three-Dimensional Shapes:
- cone: a three-dimensional shape that narrows to a point from a circular face.
- cube: a three-dimensional shape with 6 square faces.
- cylinder: a three-dimensional shape that is shaped like a can.
- face: the flat part of a three-dimensional shape.
- rectangular prism: a three-dimensional shape with 6 faces that are rectangles.
- three-dimensional shape: a solid shape; a shape that is not flat.