MultiplicationMultiplying by 10 and 11

http://math.pppst.com/banner_math_multiplication.gif

Multiplying by 10

Multiplying by 10 is EASY! All you do is add a zero on the

end!

http://www.pv.noacsc.org/Portals/0/H.%20Bockrath/math%20clip%20art.gif

http://www.youtube.com/watch?v=jPO5zAwfRSc

0

10

20

30

40

50

60

70

80

90

1000 10 20 30 40 50 60 70 80 90

Do you see the pattern?

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Now you try it…

10 x 4 = ?4010 x 7 =?70

10 x 9 = ?9010 x 6 = ?60

Multiplying by 11

Numbers less than 9—All you do is double the digit to get the product.

So… 11 x 5 = 5511 x 7 = 77What does 11 x 8 = ?88 http://

sekolahcikal.files.wordpress.com/2009/12/funmath.jpg

What’s the pattern here?

11

22

33

44

55

66

77

88

99

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What do you do for numbers greater than 9?

http://www.youtube.com/watch?v=QMPDLQ71PI8

Multiplying Numbers Greater Than 9

11 x 26 = ?If you take 2+6 you get 8.Put the 8 between the 2 and the 6 to

get your answer.11 x 26 = 286

http://www.cfsnc.org/uploaded/News_and_Events/images/Lower_School/math_clip_art_01.jpg

Now you try it…

11 x 23 = ?

25311 x 32 = ?352

11 x 18 = ?19811 x 12 = ?132

Mixed Review

11 x 35 = ?38510 x 9 = ?9010 x 4 = ?40

11 x 5 = ?5510 x 2 = ?2011 x 8 = ?88

Works Cited

Handley, B. "Speed Math for Kids: The Fast, Fun Way to Do Basic Calculations." ERIC: Reports. U.S. Department of Education, 2007. Educators Reference Complete. Web. 11 Oct. 2011.

Pierce, R. (18 Feb 2011). "Multiplication - Times Tables." Retrieved from http://www.mathsisfun.com/tables.html

Rak Productions. (September, 1999). Multiplication Song (multiply by 10). Retrieved from http://www.youtube.com/watch?v=jPO5zAwfRSc

Rak Productions. (September, 1999). 11 Times Trick (for numbers greater than 9)-Multiplication Math Song. Retrieved from http://www.youtube.com/watch?v=QMPDLQ71PI8

Su, Francis E. (1999) Multiplication by 11. Retrieved from http://www.math.hmc.edu/funfacts