Curriculum / Math / 4th Grade / Unit 2: Multi-Digit Multiplication / Lesson 1
Math
Unit 2
4th Grade
Lesson 1 of 18
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Solve multiplicative comparison problems with a larger unknown. Distinguish multiplicative comparison from additive 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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Jaylene is collecting books. She has 7 comic books. She has 3 times as many science books as comic books. How many science books does she have? Represent the situation as an equation to solve.
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Which option earns more money? How much more?
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Problem Set
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Rebecca is walking down the street. It takes her 10 minutes to get to the 7-Eleven. It takes her 2 times as long to walk back home. How long did it take her to get back home?
Sasha has 6 red M&Ms. She has 3 more green M&Ms than red M&Ms. How many green M&Ms does she have?
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Lesson 2
Topic A: Multiplicative Comparison
4.OA.A.1 4.OA.A.2
Solve multiplicative comparison problems with a smaller unknown.
Solve multiplicative comparison problems with an unknown multiplier. Interpret a multiplication equation as a comparison.
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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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