Glossary

Addend: The numbers you add to find a sum. (p. 24)

Addition: The operation of adding two or more numbers. (p. 24)

Angle: Two rays with the same endpoint. (p. 126)

Area: The number of square units that cover a region. (p. 135)

Compare: To tell if a number is less than (<), greater than (>), or equal to (=) another number. (p. 18)

Data: Information you collect. (p. 116)

Denominator: The number below the fraction bar, or line, in a fraction. (p. 94)

Difference: The answer to a subtraction problem. (p. 26)

Digit: Numbers have digits. Digits show hundreds, tens, and ones. (p. 14)

461 has 3 digits.

Divide: To separate an amount into equal groups. (p. 57)

Dividend: The number that is divided. (p. 58)

Division: The operation of dividing a number by another number. (p. 57)

Divisor: The number by which another number is divided. (p. 58)

Equivalent Fractions: Fractions that name the same amount. (p. 97)

are equivalent fractions.

Estimate: To make a careful guess. (p. 37)

Expanded Form: Numbers that show the values of each digit. (p. 17)

129 = 100 + 20 + 9

Factors: Numbers that are multiplied together. (p. 47)

Fraction: A number that names part of a whole or set. (p. 92)

Greater Than (>): (p. 18)

3 > 2 3 is greater than 2.

Hexagon: A figure with 6 sides. (p. 127)

Less Than (<): (p. 18)

3 < 4 3 is less than 4.

Line: A straight, endless path in both directions. (p. 126)

Line Plot: A way to show data on a line. (p. 122)

Line Segment: Part of a line that is between two points called endpoints. (p. 126)

Mass: The amount of matter in something. (p. 111)

Multiple: The product of a number and any other number. (p. 48)

2, 4, and 6 are multiples of 2.

Multiplication: The operation of multiplying two numbers. (p. 46)

Multiply: To combine equal groups and get a product. (p. 46)

Number Line: A line marked with equal parts that shows numbers in order. (p. 48)

Numerator: The number above the fraction bar, or line, in a fraction. (p. 94)

Octagon: A figure with 8 sides. (p. 127)

Operation: A set of steps that follows certain rules and is carried out on one or more numbers. Addition, subtraction, multiplication, and division are some operations. (p. 113)

Parallelogram: A quadrilateral whose opposite sides are parallel, or do not cross. (p. 128)

Pentagon: A figure with 5 sides. (p. 127)

Perimeter: The distance around a figure. (p. 140)

Place Value: The value of the place each digit has in a number. (p. 14)

In 42, the digit 4 is in the tens place and has a value of 40.

Polygon: A closed figure made of three or more line segments. (p. 127)

Product: The answer to a multiplication problem. (p. 47)

Quadrilateral: Any polygon with 4 sides. (p. 128)

Quotient: The answer to a division problem. (p. 58)

Ray: A part of a line with an endpoint that goes on and on in one direction. (p. 126)

Rectangle: A figure with 4 sides and 4 right angles. (p. 128)

Rhombus: A quadrilateral with sides that are the same length and whose opposite sides are parallel. (p. 129)

Round: To change a number to the nearest ten, hundred, etc. (p. 20)

Skip Count: To count by something other than ones. (p. 48)

Skip count by 5s. 5, 10, 15, 20, …

Square: A figure with 4 right angles and 4 equal sides. (p. 128)

Standard Form: A way to show a number using only digits. (p. 17)

731 is in standard form.

Subtraction: The operation of subtracting a number from another number. (p. 26)

Sum: The answer to an addition problem. (p. 24)

Tally Chart: A chart that shows data using marks called tallies. (p. 116)

Tally Mark: A mark that stands for 1 of something on a tally chart. (p. 116)

Triangle: A figure with 3 sides. (p. 127)

Volume: The amount of space taken up by something. (p. 109)

Word Form: A way to show a number using words. (p. 17)

One hundred fifteen is in word form.