Associative Property
Lesson Plans and Worksheets for Grade 3
Lesson Plans and Worksheets for all Grades
More Lessons for Grade 3
Common Core For Grade 3
Common Core Standards: 3.OA.3, 3.OA.4, 3.OA.5, 3.OA.7, 3.OA.1, 3.OA.2, 3.OA.6, 3.OA.8
New York State Common Core Math Module 3, Grade 3, Lesson 9
Application Problem
Complete the Application Problems Sheet
These problems give students practice solving equations with parentheses. This sequence of problems is specifically designed so that students recognize that the position of the parentheses does not change the answer in multiplication problems with more than two factors. (The same is true for addition.)
Concept Development
Rewrite 16 × 3 as (8 ×2) × 3 and then as 8 × (2 × 3) = 8 × 6 = 48
a) 3 × 12 = _____
b) (3 × 3) × 4
= _____ × 4
= _____ Lesson 9 Homework
1. Use the array to complete the equation.
a. 3 × 16 = _____
b. (3 × ____) × 8
= _____ × _____
= _____
2. Place ( ) in the equations to simplify and solve.
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