4th grade Math vocabulary answers
Check yourself on the meanings of these words. Click on "4th grade Math vocabulary answers" or "Chapters" to go back to the Math home page.
cardinal number: a number that tells how many items are in a group.
expanded form: a way to write numbers by showing the value of each digit.
hundreds: 3 places values to the left.
ordinal numbers: a number telling order or position. (ex. 1st, 2nd)
period: each group of 3 digits in a number; a comma separates periods.
round: to express a number to the nearest thousandths, hundredths, tenth, one, ten, hundred, thousand, and so on.
standard form: a way to write numbers using the digits 0-9, with each digit having a place value.
ten thousands: 5 places values to the left.
addend: any of the numbers that are added.
doubles: 2 addends that are the same.
front-end estimation: the method using only the front-end digits to estimate a sum, difference, product, or quotient.
group: when numbers are placed together.
grouping property: the property that states that the way addends or factors are grouped, does not change the answer.
regroup: to exchange equal amounts.
ten: 2 place values to the left.
array: an arrangement of objects in rows and columns.
fact family: a set of related addition and subtraction or multiplication and division number sentences.
inverse operations: opposite operations, such as multiplication and division, that undo each other.
one: 1st place value to left.
order property of multiplication: the property which states that when the order of 2 factors is changed, the product is the same.
product: the answer to a multiplication problem
quotient: the answer to a division problem.
zero property of multiplication: the property that states that the product of zero and nay number is zero.
A.M.: the time between midnight and noon. (morning)
bar graph: a graph that uses bars of different heights or lengths to show and compare information.
digital: a type of clock that uses numbers written out to tell the time.
frequency table: a table that uses numbers to show how often an item occurs.
line graph: a graph that uses a line to show how something changes over a period of time.
ordered pair: a pair of numbers used to locate a point on a grid. The 1st number tells the left-right position and the 2nd number tell the up-down position.
pictograph: a graph that uses pictures to show and compare information.
P.M. the time between noon and midnight. (afternoon/evening)
calculator: an instrument used to figure out mathematical problems.
estimate: to find an answer that is close to the exact answer.
factor: a number that is multiplied by another number to find a product.
multiple: a number that is the product of a given number and another whole number.
graph: a drawing used to show and compare information.
guess: to give an educated estimate of what you think the answer will be.
n: can use this to represent a missing number.
pattern: used when multiplying multiples by following the pattern of zeros.
centimeter: (cm) a unit of length in the metric system. 100 cm=1 meter.
decimeter: (dm) a unit of length in the metric system. 100 dm=1 meter.
foot: (ft) a unit of length in the customary system. 12 inches=1 foot.
inch: (in) a unit of length in the customary system.
kilometer: (km) a unit of length in the metric system. 1,000 meters=1 km.
mass: the amount of matter of an object.
meter: (m) a unit of length in the metric system. 100 cm=1 m.
mile: (mi) a unit of length in the customary system. 5,280 ft.=1 mi.
perimeter: the distance around a figure.
yard: (yd) a unit of length in the customary system. 3 ft=1 yd.
average: the number found by dividing the sum of a set by a set of numbers by the number of addends.
compatible numbers: pairs of numbers that are easy to compute mentally.
dividend: the number that is to be divided in a division problem.
divisor: the number that divides the dividend.
median: the middle number in an ordered series of numbers.
quotient: the answer in a division problem.
range: the difference between the greatest and the least numbers in a set of data.
remainder: the amount left over when you find the quotient.
acute angle: an angle that has a measure less than a right angle.
diameter: a line segment that passes through the center of a circle and has its endpoints on the circle.
intersecting lines: two lines that cross at exactly one point.
obtuse angle: an angle that has a measure greater than a right angle.
parallel lines: lines in a plane that stay exactly the same distance apart. (never touch).
perpendicular lines: two lines that intersect to form right angles.
plane figure: a closed figure that lies on a flat surface.
radius: a line segment with one endpoint at the center of a circle and the other endpoint on the circle.
similar figures: figures that have the same shape but may not have the same size.
solid figures: a closed, flat shape that is all on one plane.
denominator: the number below the bar in a fraction. It tells the total number of equal parts or groups into which the whole or group has been divided.
equivalent fractions: two or more fractions that name the same amount.
fraction: a number that names part of a whole or part of a group.
like fractions: have the same denominator.
mixed number: a number that is made up of a whole number and a fraction or a whole number and another whole number.
numerator: the number above the bar in a fraction. It tells how many of the equal parts of the whole are being considered.
simplest form: a fraction whose numerator and denominator have no common factor greater than 1.
unlike fractions: don't have the same denominator.
organized list: a list used to help you choose from several different choices.
probability: the chance that a given event will occur.
tree diagram: used to see all the possibilities.
decimal: a number that uses place value and a decimal point to show values less than one, such as tenths, hundredths, and so on.
decimal point: a period used in decimal numbers to separate the whole number part from the decimal part.
equivalent decimals: two or more decimals that name the same amount.
hundredths: 3 place values to the right of a decimal point.
tenths: 2 place values to the right of a decimal point.
compatible numbers: pairs of numbers that are easy to compute mentally.
digit: a number.
multiplication: the process of taking two numbers times each other.