Order of operations

Multiplication ConceptsMath Grade 3Miss Shannon Smrek October 14, 2009

1Facts about MultiplicationWhat is multiplication? Multiplication is repeated addition.

When is multiplication used?When there is a certain number of groups and an equal number in each group, multiplication can be used to find the total.

http://www.studyzone.org/testprep/math4/d/multiplicationsentl.cfm

2Ex: Veronica is baking cookies. She has 3 rows with 5 cookies in each. How many cookies does she have in all?

There are 3 rows of 5 5+5+5 = 153 x 5 = 15

33 x 5 = 15 Factors Product

Vocabulary4Multiplication has different meaningsYou can demonstrate multiplication by using an addition sentence or a multiplication sentence.In this example there are 4 groups of 7. Addition Sentence7+7+7+7 = 28Multiplication Sentence 7 x 4 = 28

5Practice Problems!1) Write an addition sentence and a multiplication sentence for the picture below. Given: there are 3 groups of 9.

2) There are 2 rows with 6 students in each. How many total students are there?

6Answers 1) Addition Sentence: 9 + 9 + 9 = 27 Multiplication Sentence: 3 x 9 = 27

2) There are 12 total students7Click on the website below to try more multiplication problemsAplusmath.com : Worksheets : Online Multiplication8You can also use a chart to demonstrate multiplicationhttp://www.mathsisfun.com/tables.html

9This game will help you learn your multiplication facts by applying them to a real life situation. When you go to this website read the introduction, and then press play. Select level 3, and you are ready to learn! http://www.multiplication.com/flashgames/punypetshop.htm

Own Your Own Pet Shop!10CreditsCharles, et al. Ohio Mathematics: Scott Foresman-Addison Wesley. Vol. 1. Illinois: Pearson Education, Inc. 2005.

Multiplication Sentences. Elementary Test Prep Center. Studyzone.org. N.p. 2001. Web. 14 Oct. 2009.

Multiplication-Times Tables. Mathisfun.com. N.p.26 Oct. 2009. Web. 27 Oct. 2009.

Puny Pet Shop. Multiplication.com Krimsten Publishing, 2009. Web. 25 Oct. 2009.

11Credits (Continued) Smrek, S. (2009). Cookie Image. Taken on October 25, 2009 in Youngstown, OH.

Smrek, S. (2009). Heart Image. Taken on October 29, 2009 inYoungstown, OH.

Smrek, S. (2009). Multiplication Table. Taken on October 29, 2009 in Youngstown, OH.

Smrek, S. (2009). Square Image. Taken on October 27, 2009 in Youngstown, OH.

Worksheets. AplusMath.com. Dreambox, 7 Feb. 2009. Web. 23 Oct. 2009.

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