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Published byLeonel Jack Modified about 1 year ago

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Multiplication Made Easy

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

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12345678910 1123456789 22 33 44 55 66 77 88 99 1-same as the number; imagine it as one group of the number

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12345678910 1123456789 22468 1214161820 336 448 5510 6612 7714 8816 9918 10 20 2-double the original

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12345678910 1123456789 22468 1214161820 33612 448 16202428323640 551020 661224 771428 881632 991836 10 2040 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=______

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12345678910 1123456789 22468 1214161820 336912151821242730 44812 551015 661218 771421 881624 991827 10 2030 3- we double the number and then add one more set

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12345678910 1123456789 22468 1214161820 336912151821242730 4481216202428323640 5510152025 6612182436 7714212849 8816243264 9918273681 10 203040100 Square numbers-make a diagonal on the number chart

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

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12345678910 1123456789 22468 1214161820 336912151821242730 4481216202428323640 551015202550 661218243660 771421284970 881624326480 991827368190 10 2030405060708090100 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=_______

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12345678910 1123456789 22468 1214161820 336912151821242730 4481216202428323640 55101520253035404550 66121824303660 77142128354970 88162432406480 99182736458190 10 2030405060708090100 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=

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12345678910 1123456789 22468 1214161820 336912151821242730 4481216202428323640 55101520253035404550 6612182430365460 7714212835496370 8816243240647280 99182736455463728190 10 2030405060708090100 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=________

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12345678910 1123456789 22468 1214161820 336912151821242730 4481216202428323640 55101520253035404550 66121824303642485460 77142128354249566370 88162432404856647280 99182736455463728190 10 2030405060708090100 6x7; 6x8; 7x8= the ugly ones

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

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1234567891011 11234567891011 2246810121416182022 33691215182124273033 448121620242832364044 5510152025303540455055 6612182430364248546066 7714212835424956637077 8816243240485664728088 9918273645546372819099 10 2030405060708090100110 11 2233445566778899110121 11—double the digit

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123456789101112 1123456789101112 224681012141618202224 3369121518212427303336 44812162024283236404448 551015202530354045505560 661218243036424854606672 771421283542495663707784 881624324048566472808896 9918273645546372819099108 10 2030405060708090100110120 11 2233445566778899110121132 12 24364860728496108120132144 12

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Challenge Videos to Increase Speed Breaking down multiplication: http://www.youtube.com/watch?v=wUiBibMbzo Y 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=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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