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Multiplication Made Easy

Multiplication Made Easy. What is multiplication?. Rows and columns 4 x 3= 4 groups of 3. 1-same as the number; imagine it as one group of the number. 2-double the original. 4- we double the number than double again!. 4s. If 4 x 6= 6x2x2=12+12=24 Then 234x4=234x234=(468)x2 =936

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Multiplication Made Easy

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  1. Multiplication Made Easy

  2. What is multiplication? • Rows and columns • 4 x 3= 4 groups of 3

  3. 1-same as the number; imagine it as one group of the number

  4. 2-double the original

  5. 4- we double the number than double again!

  6. 4s • If 4 x 6= 6x2x2=12+12=24 • Then 234x4=234x234=(468)x2 =936 • Try 22x4=______

  7. 3- we double the number and then add one more set

  8. Square numbers-make a diagonal on the number chart

  9. Also • 11x11=121 • 12x12=144 • Try 13x13=____

  10. 10-just add a zero

  11. 10s • 10x5=50 (5 and add a zero at the end) • 10x 234=2340 • Try 10 x 3456=_______ • Try 1000 x 239=_______

  12. 5-multiply by 10 and then divide by two; all numbers end with 0 or 5

  13. 5s Try 5 x4= (10 x 4)/2=40/2=20 • Try 5 x32= • Try 5 x 400=

  14. 9-multiply by 10 and remove a set; the digits always add to 9

  15. 9s • If 9x4=36 (10x4-4) • Then 9x43= ____ (10x43-43) • Try 9x290=________ • Try 9X365=________

  16. 6x7; 6x8; 7x8= the ugly ones

  17. The ugly ones • 6x7=42 (e.g. 6x7=(6x6)+(6x1)) • 6x8=48 • 7x8=56

  18. 11—double the digit

  19. 12

  20. Challenge Videos to Increase Speed • Breaking down multiplication: • http://www.youtube.com/watch?v=wUiBibMbzoY • Be a Human Calculator: • http://www.youtube.com/watch?v=rf3_36a9MWc • http://www.youtube.com/watch?v=Et_VJAA_fuE • http://www.youtube.com/watch?v=PYrgjMubh-c • http://www.youtube.com/watch?v=7X85-tylGTQ

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