Multiplication of Large Numbers


Multiplication of Large Numbers teaches students how to use the standard algorithm to multiply numbers with multiple digits. Students will learn a couple of tips to help them set up their problems in a way that makes them easier to solve. The lesson provides many examples and opportunities for students to practice what they learned. Students will be able to use a calculator to check their answers.

The “Options for Lesson” section offers a few suggestions or alternatives that you can employ as you deliver this lesson plan. For instance, you may want to reinforce the cumulative property of multiplication at this time and allow students to use both this property and a calculator to check their work. You might also choose to put students in groups with different multiplication parameters to allow for some differentiation.

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What our Multiplication of Large Numbers lesson plan includes

Lesson Objectives and Overview: Multiplication of Large Numbers teaches students to multiply numbers with two or more digits using a standard method. Students will be able to use a calculator to check their work. Students should already know the basics of multiplying and will draw upon previous knowledge to help them in this lesson. By the end of the lesson, they should be able to multiply large numbers easily and fluently. This lesson is for students in 5th grade.

Classroom Procedure

Every lesson plan provides you with a classroom procedure page that outlines a step-by-step guide to follow. You do not have to follow the guide exactly. The guide helps you organize the lesson and details when to hand out worksheets. It also lists information in the green box that you might find useful. You will find the lesson objectives, state standards, and number of class sessions the lesson should take to complete in this area. In addition, it describes the supplies you will need as well as what and how you need to prepare beforehand. The supplies you will need for this lesson are index cards, markers, and the handouts. To prepare for this lesson ahead of time, you can gather the supplies and copy the handouts.

Options for Lesson

Included with this lesson is an “Options for Lesson” section that lists a number of suggestions for activities to add to the lesson or substitutions for the ones already in the lesson. An optional adjustment to this lesson is to let students check their work using a calculator. You can make sure to emphasize the commutative property of multiplication as a part of this lesson. You can also put students in small groups and give each group different multiplication parameters to allow for differentiation.

Teacher Notes

The teacher notes page includes a paragraph with additional guidelines and things to think about as you begin to plan your lesson. This page also includes lines that you can use to add your own notes as you’re preparing for this lesson.


Multiplication of Large Numbers

The Multiplication of Large Numbers lesson plan includes two pages of content. The lesson begins by explaining that you can use a standard algorithm to multiply large numbers. There are two tips on the first content page that you can explain before the students begin. The first is to always write the number with the most digits on the top if they do not have the same number of digits. The second tip is to align the numbers to the final digit.

The lesson then proves several examples of how to set up these problems. It explains each step one by one. At one point, it describes the zero placeholder. This is an important feature of multiplication. Students must understand this piece of information to successfully multiply numbers with multiple digits. You can take your time explaining this part to ensure they understand how zero placeholders work.


The Multiplication of Large Numbers lesson plan includes three worksheets: an activity worksheet, a practice worksheet, and a homework assignment. You can refer to the guide on the classroom procedure page to determine when to hand out each worksheet.


For the activity worksheet, you will need to provide a number of cards with different numbers on them. Students will write down two numbers from the cards and multiply them together. There are six blanks on the worksheet. They will repeat this task five more times to fill in each empty square.


The practice worksheet is similar to the activity worksheet. However, there are nine boxes with two numbers already written. Students will multiply each pair of numbers using the standard method and show their work in the available space.


Similar to the practice, students will have to multiply nine pairs of numbers. However, they will first need to arrange the two numbers so that the one with more digits is at the top. This way, they can more easily calculate the right answer using the standard algorithm.

Worksheet Answer Keys

This lesson plan includes answer keys for the practice worksheet and the homework assignment. If you choose to administer the lesson pages to your students via PDF, you will need to save a new file that omits these pages. Otherwise, you can simply print out the applicable pages and keep these as reference for yourself when grading assignments.

Additional information


5th Grade



State Educational Standards


Lessons are aligned to meet the education objectives and goals of most states. For more information on your state objectives, contact your local Board of Education or Department of Education in your state.