5th Grade Math Vocabulary (Definition First)

An angle that has a measure less than a right angle (less than 90 degrees and greater than 0 degrees)

• Acute Angle
• The number by which another number is divided.
• A series of numbers placed at fixed distances on a graph to help label the graph.
• A way to write numbers in standard English. Ex. 4,829 = four thousand, eight hundred twenty-nine.

Tags

CCSS.4.G.A.1

A triangle that has three acute angles.

• Acute Triangle
• A triangle that has one obtuse angle.
• A symbol used to separate dollars from cents in money, and to separate the ones place from the tenths place in a decimal.
• The horizontal number line on a coordinate plane.

Tags

CCSS.4.G.A.2

A number that is to be added to another number.

• Addend
• Extending left and right.
• A tool used for measuring or drawing angles.
• The point at either end of a line segment or the starting point of a ray.

The process of finding the sum (total number) of items when two or more groups of items are joined; the opposite of subtraction.

• Addition
• A symbol used to separate dollars from cents in money, and to separate the ones place from the tenths place in a decimal.
• A series of numbers placed at fixed distances on a graph to help label the graph.
• The amount of matter in an object.

Tags

CCSS.2.OA.A.1

A shape formed by two line segments or rays that share the same endpoint.

• Angle
• A number close to an exact amount (rounding or compatible numbers).
• The number by which another number is divided.
• A metric unit used to measure length or distance. 10 meters = 1 dekameter.

Tags

CCSS.HSG.CO.A.1

The measure of the number of unit squares needed to cover a surface.

• Area
• The point where two or more rays meet; the point of intersection of two sides of a polygon; the point of intersection of three (or more) edges of a solid figure; the top point of a cone; the plural of vertex is vertices.
• An instrument used to weigh objects and to compare the weights of objects.
• A way to write numbers by showing the value of each digit.

Tags

CCSS.3.MD.C.5A

An arrangement of objects in rows and columns.

• Array
• A metric unit used to measure mass. 1,000 milligrams - 1 gram.
• A whole number that has a 1, 3, 5, 7, or 9 in the ones place.
• A figure having length, width, and height.

If the GROUPING of addends changes, the sum stays the same.

• Associative Property of Addition
• One or one thousand equal parts.
• A triangle with no congruent sides.
• A polygon with six sides and six angles.

If the GROUPING of factors change, the product stays the same.

• Associative Property of Multiplication
• A grouping of three numbers on a place value chart that are separated by commas.
• The result of division.
• A tool used for measuring or drawing angles.

Tags

CCSS.5.NBT.B.7

To equalize in weight or number.

• Balance
• The process of sharing a number of items to find how many equal groups can be made or how many items will be in each equal group; the inverse (opposite) operation of multiplication.
• A metric unit used to measure capacity. 1,000 milliliters = 1 liter.
• The least number that is a common multiple of two or more numbers.

Tags

CCSS.4.MD.A.2