Section 1
Multiply Multiples of 10 by Decomposing Factors
Property
To multiply two-digit multiples of 10, you can decompose each number, then use the associative property to regroup the factors.
This is the same as multiplying the units: .
In this Grade 4 Eureka Math lesson from Chapter 10, students learn to multiply two-digit multiples of 10 by two-digit multiples of 10, such as 30 × 20, using place value charts and the area model. Students practice decomposing expressions into unit form and applying the associative property to find products like 3 tens × 2 tens = 6 hundreds. Fluency activities reinforce multiplying by multiples of 10, 100, and 1,000 to build the foundational skills needed for the area model approach.
Section 1
Multiply Multiples of 10 by Decomposing Factors
To multiply two-digit multiples of 10, you can decompose each number, then use the associative property to regroup the factors.
This is the same as multiplying the units: .
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Expand to review the lesson summary and core properties.
Section 1
Multiply Multiples of 10 by Decomposing Factors
To multiply two-digit multiples of 10, you can decompose each number, then use the associative property to regroup the factors.
This is the same as multiplying the units: .
Book overview
Jump across lessons in the current chapter without opening the full course modal.
Continue this chapter