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Lesson Plans and Worksheets for Grade 3

Lesson Plans and Worksheets for all Grades

Common Core For Grade 3

More Lessons for Grade 3 Math

Examples, videos, and solutions to help Grade 3 students learn how to use place value strategies and the associative property*n* × (*m* × 10) = (*n* × *m*) × 10 (where *n* and *m* are less than 10) to multiply by multiples of 10.

Common Core Standards: 3.OA.5, 3.OA.8, 3.OA.9, 3.NBT.3, 3.OA.1

### New York State Common Core Math Grade 3, Module 3, Lesson 20

Worksheets for Grade 3, Module 3, Lesson 20

Application Problem

1. Use the chart to complete the equations. Then solve.

a. (2 × 5) × 10

= (10 ones) × 10

= _______

b. 2 × (5 × 10)

= 2 × (5 tens)

= _______

2. Solve. Place ( ) in (c) and (d) as needed to find the related fact.

a. 3 × 20 = 3 × (2 × 10)

= (3 × 2) × 10

= 6 × 10

= ______

b. 3 × 30 = 3 × (3 × 10)

= (3 × 3) × 10

= ______ × 10

= ______

c. 3 × 40 = 3 × (4 × 10)

= 3 × 4 × 10

= ______ × 10

= ______

d. 3 × 50 = 3 × 5 × 10

= 3 × 5 × 10

= ______ × 10

= ______

3. Danny solves 5 × 20 by thinking about 10 × 10. Explain his strategy.

Lesson 20 Homework

Multiply by Multiples of 10 Using the Place Value Chart

2 c) 3 × 40 = 3 × (4 × 10)

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

Lesson Plans and Worksheets for Grade 3

Lesson Plans and Worksheets for all Grades

Common Core For Grade 3

More Lessons for Grade 3 Math

Examples, videos, and solutions to help Grade 3 students learn how to use place value strategies and the associative property

Common Core Standards: 3.OA.5, 3.OA.8, 3.OA.9, 3.NBT.3, 3.OA.1

Application Problem

Model 3 × 4 on a place value chart. Then explain how the array can help you solve 30 × 4.

Note: This problem reviews multiplying by multiples of 10 from Lesson 19. In today’s Concept Development, students will build on their understanding from Lesson 19 to multiply by multiples of 10 using the associative property. Lesson 20 Homework1. Use the chart to complete the equations. Then solve.

a. (2 × 5) × 10

= (10 ones) × 10

= _______

b. 2 × (5 × 10)

= 2 × (5 tens)

= _______

2. Solve. Place ( ) in (c) and (d) as needed to find the related fact.

a. 3 × 20 = 3 × (2 × 10)

= (3 × 2) × 10

= 6 × 10

= ______

b. 3 × 30 = 3 × (3 × 10)

= (3 × 3) × 10

= ______ × 10

= ______

c. 3 × 40 = 3 × (4 × 10)

= 3 × 4 × 10

= ______ × 10

= ______

d. 3 × 50 = 3 × 5 × 10

= 3 × 5 × 10

= ______ × 10

= ______

3. Danny solves 5 × 20 by thinking about 10 × 10. Explain his strategy.

Multiply by Multiples of 10 Using the Place Value Chart

2 c) 3 × 40 = 3 × (4 × 10)

= 3 × 4 × 10

= ______ × 10

= ________

d)
3 × 50 = 3 × 5 × 10

= 3 × 5 × 10

= ______ × 10

= _______

Rotate to landscape screen format on a mobile phone or small tablet to use the **Mathway** widget, a free math problem solver that **answers your questions with step-by-step explanations**.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

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