
CHAPTER 2: MULTIPLY BY A 1DIGIT NUMBER
In Chapter 2 students will:
 Relate multiplication equations and comparison statement
 solve problems involving multiplicative comparison & additive comparison
 Multiply 10s, 100s, & 1,000s by whole numbers through ten
 Estimate products & determine if exact answers to multiplication problems are reasonable
 Multiply numbers using the Distributive Property
 Use expanded form to multiply a multidigit number by a 1digit number
 Use place value & partial products to multiply a multidigit number by a 1digit number
 Use mental math & properties to multiply a multidigit number by a 1digit number
 Multiply a multidigit number by a 1digit number with regrouping
 Recognize & solve multistep problems using equations
Vocabulary:
 factor – a number that is multiplied by another number to find a product
 product – the answer to a multiplication problem
 Distributive Property of Multiplication – the property that states that multiplying a sum by a number that is the same as multiplying each added by the number and them adding the products
ex: 5x13 = (5x10) + (5x3)  partial product – a method of multiplying in which the ones, tens, hundreds, and so on are multiplied separately and then the products are added together
 expanded form – a way to write numbers by showing the value of each digit
 Associative Property of Multiplication – the property that states that you can group factors in different ways and get the same product
ex: (6x10)x10 = 6x(10x10)  estimate – a number close to an exact amount
 round – to replace a number with another number that tells about how many or how much
Chapter 2 Standards: Operations and Algebraic Thinking; Number and Operations in Base Ten
Use the four operations with whole numbers to solve problems;
CC.4.OA.1 Interpret a multiplication equation as a comparison, e.g., interpret 35 = 5x7 as a statement that 35 is 5 times as many as 7 and 7 times as many as 5. Represent verbal statements of multiplicative comparisons as multiplication equations.
Use the four operations with whole numbers to solve problems;
CC.4.OA.2 Multiply or divide to solve word problems involving multiplicative comparison, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem, distinguishing multiplicative comparison from additive comparison.
Use the four operations with whole numbers to solve problems;
CC.4.OA.3 Solve multistep word problems posed with whole numbers and having wholenumber answers using the four operations, including problems in which remainders must be interpreted. Represent these problems using equations with a letter standing for the unknown quantity. Assess the reasonableness of answers using mental computation and estimation strategies including rounding.
Use place value understanding and properties of operations to perform
multidigit arithmetic;
CC.4.NBT.5 Multiply a whole number up to four digits by a onedigit whole number, and multiply two twodigit numbers, using strategies based on place value and the properties of operations. Illustrate and explain the calculation by using equations, rectangular arrays, and/or area models.

Chapter 2 videos:
Lesson 2.1 Multiplication Comparisons (CC.4.OA.1)
Lesson 2.2 Comparison Problems (CC.4.OA.2)
Lesson 2.3 Multiply 10s, 100s, & 1,000s (CC.4.NBT.5)
Lesson 2.4 Estimate Products (CC.4.NBT.5)
Lesson 2.5 Multiply Using the Distributive Property (CC.4.NBT.5)
Lesson 2.6 Multiply Using Expanded Form (CC.4.NBT.5)
Lesson 2.7 Multiply Using Partial Products (CC.4.NBT.5)
Lesson 2.8 Multiply Using Mental Math (CC.4.NBT.5)
Lesson 2.9 Multistep Multiplication Problems (CC.4.OA.3)
Lesson 2.10 Multiply 2Digit Numbers with Regrouping (CC.4.NBT.5)
Lesson 2.11 Multiply 3 & 4Digit Numbers w/Regrouping (CC.4.NBT.5)
Lesson 2.12 Solve Multistep Problems Using Equations (CC.4.OA.3)