Math- Multiplication and Division

Area

The number of square units that cover a flat surface

Area Model

A way to represent multiplication where the length and width of rectangles are the factors of the problem

Array

A set of objects arranged in equal rows and columns

Associative Property of Multiplication

If 3 or more factors are multiplied, they can be grouped in any order, and the product will stay the same.

Commutative Property of Multiplication

If the order of factors are changed, the product will stay the same

Compatible Numbers

Friendly" numbers that are easy to multiply or divide

Dividend

A number that is being divided in a division problem

Divisible

When numbers can be divided with no remainder

Division

The operation that separates objects into equal groups to find the number in each group or to find the number of equal groups

Divisor

A number the dividend is being divided by in a division problem

Each Group

ONE group

Equation

A number sentence with an equal sign

Estimate

To find an answer close to the actual answer, but is not exact

Explain

To describe how a problem is solved step by step

Equal Groups

Groups with the same number of objects in each group

Expression

A combination of numbers and operations (No equal sign)

Fact Families

Related equations using the same numbers

Factor

A number multiplied by another number

Input-Output Table

A table that has numbers that relate to each other with a rule

Justify

To prove how you know an answer is correct

Model

A diagram or drawing to represent an operation

Multiplication

The operation that joins equal groups to find a total

Multiples

A list of the products of a number times other numbers

Operations

Addition, Subtraction, Multiplication, Division

Partial Products

A multiplication strategy that breaks numbers into smaller factors that can be added together

Product

The total when numbers are multiplied together (the answer to a multiplication problem)

Reasonableness

When the answer to a problem makes sense

Repeated Addition

A way to model multiplication by adding equal groups together

Repeated Subtraction

A division strategy that subtracts the same number over and over again

Remainder

The number that is left over after dividing

Round

To change a number to the nearest ten or hundred to make it easy to estimate

Strip Diagram

A model of a math problem that uses rectangular bars with numbers and symbols

Thinking Patterns

A strategy to help choose the correct operation when solving word problems

Quotient

The answer to a division problem