# ALEX Classroom Resource

## Grade 4 Mathematics Module 3, Topic H: Multiplication of Two-Digit by Two-Digit Numbers

Classroom Resource Information

Title:

Grade 4 Mathematics Module 3, Topic H: Multiplication of Two-Digit by Two-Digit Numbers

URL:

Content Source:

EngageNY
Type: Lesson/Unit Plan

Overview:

Module 3 closes with Topic H as students multiply two-digit by two-digit numbers. Lesson 34 begins this topic by having students use the area model to represent and solve the multiplication of two-digit multiples of 10 by two-digit numbers using a place value chart. Practice with this model helps to prepare students for two-digit by two-digit multiplication and builds the understanding of multiplying units of 10. In Lesson 35, students extend their learning to represent and solve the same type of problems using area models and partial products. In Lesson 36, students make connections to the distributive property and use both the area model and four partial products to solve problems. Lesson 37 deepens students’ understanding of multi-digit multiplication by transitioning from four partial products with the representation of the area model to two partial products with the representation of the area model and finally to two partial products without representation of the area model. Topic H culminates at the most abstract level with Lesson 38 as students are introduced to the multiplication algorithm for two-digit by two-digit numbers. Knowledge from Lessons 3437 provides a firm foundation for understanding the process of the algorithm as students make connections from the area model to partial products to the standard algorithm (4.NBT.5). Students see that partial products written vertically are the same as those obtained via the distributive property: 4 twenty-sixes + 30 twenty-sixes = 104 + 780 = 884.

Content Standard(s):
 Mathematics MA2019 (2019) Grade: 4 3. Determine and justify solutions for multi-step word problems, including problems where remainders must be interpreted. a. Write equations to show solutions for multi-step word problems with a letter standing for the unknown quantity. b. Determine reasonableness of answers for multi-step word problems, using mental computation and estimation strategies including rounding. Unpacked Content Evidence Of Student Attainment:Students: When given multi step word problems, Solve a variety of multistep word problems involving all four operations on whole numbers including problems where remainders must be interpreted. Explain and justify solutions using connections between the problem and related equations involving a single (letter) unknown. Evaluate the reasonableness of solutions using estimation strategies. Note: Multi step problems must have at least 3 steps.Teacher Vocabulary:Operation Multi Step problem Remainder Unknown quantity Equation Rounding Mental strategy Partition Estimation ReasonablenessKnowledge:Students know: Context situations represented by the four operations. How to calculate sums, differences, products, and quotients. Estimation strategies to justify solutions as reasonable.Skills:Students are able to: Solve multi-step word situations using the four operations. Represent quantities and operations physically, pictorially, or symbolically. Write equations to represent the word problem and use symbols to represent unknown quantities. Use context and reasoning to interpret remainders. Use estimation strategies to assess reasonableness of answers by comparing actual answers to estimates.Understanding:Students understand that: Using problem solving strategies will help them determine which operation to use to solve a problem. Remainders must be interpreted based on the context, and remainders are sometimes ignored, rounded up, or partitioned.Diverse Learning Needs: Essential Skills:Learning Objectives: M.4.3.1: Use multiplication and division within 100 to solve word problems in situations involving equal groups, arrays, and measurement quantities, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem. M.4.3.2: Solve single-step word problems. M.4.3.3: Recognize key terms to solve word problems. Examples: in all, how much, how many, in each. M.4.3.4: Solve division problems without remainders. M.4.3.5: Recall basic addition, subtraction, and multiplication facts. Prior Knowledge Skills:Demonstrate computational understanding of multiplication and division by solving authentic problems with multiple representations using drawings, words, and/or numbers. Identify key vocabulary words to solve multiplication and division word problems. Examples: times, every, at this rate, each, per, equal/equally, in all, total. Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem. Recall basic multiplication facts. Add and subtract within 20. Represent repeated addition, subtraction, and equal groups using manipulatives. Distinguish between rows and columns. Use repeated addition to solve problems with multiple addends. Count forward in multiples from a given number. Examples: 3, 6, 9, 12; 4, 8, 12, 16. Recall doubles addition facts. Model written method for composing equations. Alabama Alternate Achievement Standards AAS Standard: M.AAS.4.1 Solve one-step word problems involving real-life situations using the four operations within 100 without regrouping and select the appropriate method of computation when problem solving. Mathematics MA2019 (2019) Grade: 4 11. Find the product of two factors (up to four digits by a one-digit number and two two-digit numbers), using strategies based on place value and the properties of operations. a. Illustrate and explain the product of two factors using equations, rectangular arrays, and area models. Unpacked Content Evidence Of Student Attainment:Students: Use strategies based on place value, properties of operations, rectangular arrays, area models, and equations to illustrate and explain the product of two factors (up to four digits by a one-digit number and two two-digit numbers). Note: Standard algorithm is not an expectation for grade 4.Teacher Vocabulary:Product Factor Compose Decompose Digit Strategy Place value Properties of operations Equation Rectangular array Area model Partial product Multiple of 10Knowledge:Students know: How to compose and decompose numbers in a variety of ways using place value and the properties of operations. How to represent the product of two factors using an area model. Use strategies based on place value (partial products), the properties of operations, arrays and area models to represent a two digit factor times a two digit factor.Skills:Students are able to: Use strategies based on place value and the properties of operations to find products. Illustrate the product of two factors using rectangular arrays and area models. Explain the product of two factors using equations. Make connections between models and equations.Understanding:Students understand that: arrays, area models, place value strategies, and the properties of operations can be used to find products of a single digit factor by a multi-digit factor and products of two two-digit factors. Diverse Learning Needs: Essential Skills:Learning Objectives: M.4.11.1: Divide within 100, using strategies such as the relationship between multiplication and division (e.g. knowing that 8 x 5 = 40, one knows 40 ÷ 5 = 8). M.4.11.2: Divide within 100, using strategies such as properties of operations. M.4.11.3: Multiply within 100, using strategies such as properties of operations. M.4.11.4: Multiply within 100, using strategies such as the relationship between multiplication and division (e.g. knowing that 8 x 5 = 40, one knows 40 ÷ 5 = 8). M.4.11.5: Recall products of two one-digit numbers. M.4.11.6: Name the first 10 multiples of each one-digit natural number. Example: 7, 14, 21, 28, 35, 42, 49, 56, 63, 70. M.4.11.7: Recall basic addition, subtraction, and multiplication facts. Prior Knowledge Skills:Apply divisibility rules for 2, 5, and 10. Example: Recognizing that 32 is divisible by 2 because the digit in the ones place is even. Apply basic multiplication facts. Understand subtraction as an unknownaddend problem. Recognize division as repeated subtraction, parts of a set, parts of a whole, or the inverse of multiplication. Name the first 10 multiples of each one-digit natural number. Example: 7, 14, 21, 28, 35, 42, 49, 56, 63, 70. Recognize multiplication as repeated addition, and division as repeated subtraction. Apply properties of operations as strategies to add and subtract. Recall basic addition and subtraction facts. Use repeated addition to solve problems with multiple addends. Count forward in multiples from a given number. Examples: 3, 6, 9, 12; 4, 8, 12, 16. Recall doubles addition facts. Model written method for composing equations. Alabama Alternate Achievement Standards AAS Standard: M.AAS.4.11 Add and subtract one and two-digit numbers up to 49 with regrouping using concrete manipulatives and visual models.
Tags: area, divide, dividends, divisor, equations, operations, perimeter, place value, quotients, rectangles, remainders, word problems