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

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Lesson Plans and Worksheets for Grade 3

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More Lessons for Grade 3

Common Core For Grade 3

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

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.

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

= ______

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

= _______