Lesson: Multiplying Two-Digit Numbers by One-Digit Numbers: Area Models Mathematics • 4th Grade

In this lesson, we will learn how to use area models to multiply two-digit numbers by one-digit numbers.

Lesson Plan

Students will be able to

draw an area model to represent the product of a two-digit number by a one-digit number,
find missing numbers in area models,
calculate products of two-digit numbers with one-digit numbers,
understand that we can break apart the number in different ways and get the same solution,
pick efficient ways to break apart the number.

Q1:

Mia drew this to help her calculate .

What expression is missing in the following:

What is ?

Q2:

Mason is learning to multiply by breaking apart factors and then adding.

For , he draws a 6-by-12 rectangle and splits it into two parts.

What is the missing expression in ?

What is ?

Q3:

Noah and Chloe want to use area to find .

Chloe splits this rectangle in half, but she can’t finish because she doesn’t know .

Noah says it is easier to use the 10 times table. How would he split the rectangle?

Pick the next step in Noah’s calculation.

Add the areas of the two parts to figure out .