Can you figure out how many stamps are needed to send all these letters without counting each one?

In this lesson you will write multiplication expressions to represent illustrations by counting the equal groups and objects in each group.

Let’s Review Multiplication is adding equal groups. 5 x 9

A Common Mistake A common mistake is to waste time counting individual objects or adding when you can solve the problem quickly by multiplying

A common mistake is to waste time counting individual objects or adding when you can solve the problem quickly by multiplying. 3 x 5 = 15

Core Lesson Multiplication is finding an unknown total, or product. x = Number of Groups Amount in Each Group

Core Lesson x = Number of Groups Amount in Each Group 5420

Core Lesson x = Number of Groups Amount in Each Group Can you figure out how many stamps are needed to send all these letters without counting each one? 7321

In this lesson you have learned how to write multiplication expressions to represent illustrations by counting the equal groups and objects in each group.

Guided Practice Write a multiplication equation to determine how many heads of cabbage are growing in the garden. x = Number of Groups Amount in Each Group 26 12

Extension Activities Label multiplication equations around the classroom for all of the equal groups of objects. Students can write the equations on sentence strips in groups. For example. There are three windows with four glass panes: 3 x 4 = 12.

Discover how many body parts are in your classroom. Students can work in groups to write multiplication equations about how many eyes are in their group, how many toes, etc. and then draw an illustration and array to go along with their facts.

Quick Quiz Write an equation to represent the number of stars in the sky below. What multiplication expression can be written for the number of sneakers below?