## Multiplying by 3

### Jennifer CatlettBay District Schools

#### Description

The students practice the multiples of three as an introduction to multiplying by three.

#### Objectives

The student understands and explains the effects of addition, subtraction, and multiplication on whole numbers, decimals, and fractions, including mixed numbers, and the effects of division on whole numbers, including the inverse relationship of multiplication and division.

The student describes a wide variety of patterns and relationships through models, such as manipulatives, tables, graphs, rules using algebraic symbols.

#### Materials

-Beacon Student Web Lesson Access
-Number lines (0-30) drawn on 6-8 feet of paper
-Counters
-Paper plates
-Index cards
-Baggies
-Math Journals

#### Preparations

Collect and prepare materials to be used. (paper plates, counters, Web School link--3 is the Magic Number-, baggies, pens, index cards, butcher paper (6-8 feet long and draw the number line 0-30 on it), Math Journals

Task cards for centers if necessary

#### Procedures

1. Count by 1s, 2s, and 3s around the room.

2. Add. 3+3; 3+3+3; 3+3+3+3; 3+3+3+3+3.

3. Model any number that is a multiple of 3 using counters and circles on the overhead, and show a multiplication problem.

Example: 24=3x8; Draw 3 circles and place 8 counters in each circle.

Group Work:
Divide the students into groups of four or five for centers. Try to rotate the groups every 10-15 minutes.

Center #1 Beacon Interactive Web Lesson: 3 is the Magic Number

Center #2 Give the group paper plates and counters. Using multiples of three. come up with as many multiplication problems as possible. Make sure that one student is the recorder.

Center #3 Have students make their 3s multiplication facts for their personal multiplication baggy book. Teacher assistance is required. Note: Use index cards and plastic baggies.

Center #4 Numberline activity.
Materials: counters, number line(0-30) drawn on 6-8 feet paper.
* Students use counters to show 3+3+3.
* Place the numberline on the floor. Students demonstrate skip counting by hopping from 3 to 6 to 9.
* Students repeat the process to find 3x4, 3x7, and so on.
* They use repeated addition to check their products.

Center #5 Math Journals
Students will write the multiplication facts for 3s and check their answers together. They will respond to the prompt -How do you multiply by 3s?-

Wrap-Up:

2. Discuss what they know about multiplying by three. Review examples of multiplying by 3s on the board allowing students to generate the answers.

3. Homework: Practice finding multiples of three in the real world. Record findings in journal.

#### Assessments

Teacher will assess students through

~observation of students talking about applying how to multiply by three using multiples at station work

~Completed Math Journal that explains how to multiply by three and how to use multiples of three to check the answers

~Students' work samples that show application of using multiples to solve problems