Related Topics:
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
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 Homework
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)
= 3 × 4 × 10
= ______ × 10
= ________
d)
3 × 50 = 3 × 5 × 10
= 3 × 5 × 10
= ______ × 10
= _______
Try out our new and fun Fraction Concoction Game.
Add and subtract fractions to make exciting fraction concoctions following a recipe.
There are four levels of difficulty: Easy, medium, hard and insane. Practice the basics
of fraction addition and subtraction or challenge yourself with the insane level.
We welcome your feedback, comments and questions about this site or page. Please submit your feedback or enquiries via our Feedback page.