Curriculum / Math / 4th Grade / Unit 2: Multi-Digit Multiplication / Lesson 3
Math
Unit 2
4th Grade
Lesson 3 of 18
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Solve multiplicative comparison problems with an unknown multiplier. Interpret a multiplication equation as a comparison.
The core standards covered in this lesson
4.OA.A.1 — Interpret a multiplication equation as a comparison, e.g., interpret 35 = 5 × 7 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.
4.OA.A.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.
The foundational standards covered in this lesson
3.OA.A.1 — Interpret products of whole numbers, e.g., interpret 5 × 7 as the total number of objects in 5 groups of 7 objects each. For example, describe a context in which a total number of objects can be expressed as 5 × 7.
3.OA.A.3 — 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.
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Mrs. Ingall wants to place students’ pencil boxes on her bookshelf for the start of the school year. We know her bookshelf is 24 inches long. Each pencil box is 2 inches wide.
a. How many pencil boxes can she line up along the bookshelf?
b. How can you use your answer from Part (a) to determine how many times as long the bookshelf is than a pencil box?
Jade has $63. Keith has $9. How many times as much money does Jade have as Keith? Represent the situation as an equation to solve.
Grade 4, Unit 1, Lesson 7 is made available by Achievement First as a part of their Open Source web portal under a CC BY 4.0 license. Copyright © 1999-2017 Achievement First. Accessed Jan. 8, 2018, 1:51 p.m..
Conner wrote the following equation:
$$6\times8=n$$
Which statement about Conner’s equation is true?
Spring 2015 Grade 4 Mathematics Test is made available by the Massachusetts Department of Elementary and Secondary Education. © 2017 Commonwealth of Massachusetts. Accessed March 23, 2018, 1:19 p.m..
Problem Set
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A baseball team scored 72 runs for the season. This was 9 times the number of runs scored in the first game. How many runs were scored in the first game?
There are 7 grams of sugar in a serving of strawberries. There are 21 grams of sugar in a serving of strawberry ice cream. How many times as much sugar is there in strawberry ice cream compared to strawberries?
Write an equation to represent the statement “448 is 32 times as many as 14.”
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Lesson 2
Lesson 4
Topic A: Multiplicative Comparison
Solve multiplicative comparison problems with a larger unknown. Distinguish multiplicative comparison from additive comparison.
4.OA.A.1 4.OA.A.2
Solve multiplicative comparison problems with a smaller unknown.
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Topic B: Multiplication of up to Four-Digit Whole Numbers by One-Digit Whole Numbers
Multiply 10, 100, and 1,000 by one- and two-digit numbers.
4.NBT.B.5
Multiply multiples of 10, 100, and 1,000 by one-digit numbers. Estimate multi-digit products by rounding numbers to their largest place value.
Multiply two-, three-, and four-digit numbers by one-digit numbers using a variety of mental strategies.
Multiply two-digit numbers by one-digit numbers.
Multiply three-digit numbers by one-digit numbers.
Multiply four-digit numbers by one-digit numbers.
Multiply two-, three-, and four-digit numbers by one-digit numbers and assess the reasonableness of the product.
Topic C: Multiplication of Two-Digit Whole Numbers by Two-Digit Whole Numbers
Multiply two-digit multiples of 10 by two-digit multiples of 10. Estimate multi-digit products by rounding numbers to their largest place value.
Multiply two-digit multiples of 10 by two-digit numbers.
Multiply two-digit numbers by two-digit numbers using a variety of mental strategies.
Multiply two-digit by two-digit numbers using four partial products.
Multiply two-digit by two-digit numbers using two partial products and assess the reasonableness of the product.
Topic D: Multi-Step Word Problems
Abstract the formulas for the area and perimeter of a rectangle and apply those formulas in real-world and mathematical problems involving multiplication, addition, and subtraction.
4.MD.A.3 4.OA.A.3
Solve two-step word problems involving multiplication, addition, and subtraction.
4.OA.A.2 4.OA.A.3
Solve multi-step word problems involving multiplication, addition, and subtraction.
4.OA.A.3
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