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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
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2-double the original
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4- we double the number than double again!
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4s
• If 4 x 6= 6x2x2=12+12=24
• Then 234x4=234x234=(468)x2 =936
• Try 22x4=______
3- we double the number and then add one more set
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Square numbers-make a diagonal on the number chart
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Also
• 11x11=121
• 12x12=144
• Try 13x13=____
10-just add a zero
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10s
• 10x5=50 (5 and add a zero at the end)
• 10x 234=2340
• Try 10 x 3456=_______
• Try 1000 x 239=_______
5-multiply by 10 and then divide by two; all numbers end with 0 or 5
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5s
Try 5 x4= (10 x 4)/2=40/2=20
• Try 5 x32=
• Try 5 x 400=
9-multiply by 10 and remove a set; the digits always add to 9
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9s
• If 9x4=36 (10x4-4)
• Then 9x43= ____ (10x43-43)
• Try 9x290=________
• Try 9X365=________
6x7; 6x8; 7x8= the ugly ones
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The ugly ones
• 6x7=42 (e.g. 6x7=(6x6)+(6x1))
• 6x8=48
• 7x8=56
11—double the digit
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110 121
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Challenge Videos to Increase Speed
• Breaking down multiplication:
• http://www.youtube.com/watch?v=wUiBibMbzo
Y
• Be a Human Calculator:
• http://www.youtube.com/watch?v=rf3_36a9MW
c
• 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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