Students will review the commutative property of multiplication. They will complete word problems using musical instrument references.

Content Standard(s):

Mathematics MA2019 (2019) Grade: 4

2. Solve word problems involving multiplicative comparison using drawings and write equations to represent the problem, using a symbol for the unknown number.

Unpacked Content

Evidence Of Student Attainment:

Students:

When given word problems involving multiplicative comparison, will solve using concrete, pictorial representations, and write related equations involving a single unknown.

Example: There are 12 children and 3 adults at the playground. How many times as many children are at the playground than adults? Represent the situation with the equation 12 = n × 3 and a tape diagram with a total of 12 and groups of 3, repeating each group 4 times to solve.

Teacher Vocabulary:

Multiplicative comparison

Times as many

Product

Factor

Multiplication

Equation

Symbol

Additive comparison

Tape diagram

Unknown

Knowledge:

Students know:

how to find products and quotients.

Recognize situations represented by multiplicative comparison.

Distinguish between multiplicative comparison and additive comparison.

Skills:

Students are able to:

Solve word problems involving multiplicative comparison.

Write equations using a symbol for the unknown to represent word problems involving multiplicative comparison.

Use drawings to represent the word situation involving multiplicative comparison.

Understanding:

Students understand that:

additive comparison focuses on the difference between two quantities and multiplicative comparison focuses on one quantity being some number times larger than another.

Diverse Learning Needs:

Essential Skills:

Learning Objectives: M.4.2.1: 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.4.2.2: Recognize key terms to solve word problems.
Examples: in all, how much, how many, in each.
M.4.2.3: Apply properties of operations as strategies to add.
M.4.2.4: Recall basic multiplication facts.
M.4.2.5: Demonstrate computational fluency, including quick recall of addition and subtraction 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.