Multiplication and Division I

Unit Review Sheet

Facts and Definitions

Lesson 1: Getting Ready to Multiply

• Array: an ordered arrangement of objects in equal rows and columns

Lesson 2: What Is Multiplication?

• Multiplication: mathematical operation that requires adding a number to itself a certain number of times; repeated addition
• Factor: number that is multiplied
• Product: the answer to a multiplication problem
• ×: mathematical symbol that means we multiply; also called the times symbol or times sign

Lesson 3: Arrays and Equal Groups

• The four strategies for multiplication are arrays, equal groups, repeated addition, and number lines.

Lesson 4: Repeated Addition and Number Lines

• A number line can be used to help solve a multiplication sentence — the first number tells the number of jumps from 0, and the second number tells how many spaces in each jump.

Lesson 5: Multiplication and the Abacus

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Lesson 6: The Commutative Property of Multiplication

• Commutative property of multiplication: math law that states that the order of the numbers doesn't matter when multiplying; a×b = b×a

Lesson 7: Multiples of 2 and 3

• Multiples: the products of a given number and other whole numbers (for example, multiples of 4 are 4, 8, 12, 16, 20…)

Lesson 8: More Practice With 2 and 3

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Lesson 9: Multiples of 4 and 5

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Lesson 10: More Practice With 2, 3, 4, and 5

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Lesson 11: Multiples of 10

• When you multiply by 10, you add a 0 to the number being multiplied by 10

Lesson 12: Problem Solving With Multiplication

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Lesson 13: What Is Division?

• Division: mathematical operation used to split a number into equal groups, find the number of groups, or find the number in each group
• Dividend: the number being divided (8÷2=4)
• Divisor: the number by which the dividend is being divided (8÷2=4)
• Quotient: the answer to a division problem (8÷2=4)
• ÷: mathematical symbol that means we divide, division symbol
• Division is the opposite of multiplication; it is repeated subtraction

Lesson 14: Multiplication and Division Fact Families

• Fact family: a group of 3 numbers that can be combined to create number sentences

Lesson 15: Unit Test

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Final Project: Multiples Mini-Posters

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