• CHAPTER 2: MULTIPLY BY A 1-DIGIT 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 multi-digit number by a 1-digit number
    • Use place value & partial products to multiply a multi-digit number by a 1-digit number
    • Use mental math & properties to multiply a multi-digit number by a 1-digit number
    • Multiply a multi-digit number by a 1-digit 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 whole-number 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 
    multi-digit arithmetic;  
    CC.4.NBT.5    Multiply a whole number up to four digits by a one-digit whole number, and multiply two two-digit 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 2-Digit Numbers with Regrouping  (CC.4.NBT.5)
    Lesson 2.11  Multiply 3 & 4-Digit Numbers w/Regrouping (CC.4.NBT.5)
    Lesson 2.12  Solve Multistep Problems Using Equations (CC.4.OA.3)