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Multiplication Made Easy. What is multiplication? Rows and columns 4 x 3= 4 groups of 3.

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Presentation on theme: "Multiplication Made Easy. What is multiplication? Rows and columns 4 x 3= 4 groups of 3."— Presentation transcript:

1 Multiplication Made Easy

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

3 12345678910 1123456789 22 33 44 55 66 77 88 99 1-same as the number; imagine it as one group of the number

4 12345678910 1123456789 22468 1214161820 336 448 5510 6612 7714 8816 9918 10 20 2-double the original

5 12345678910 1123456789 22468 1214161820 33612 448 16202428323640 551020 661224 771428 881632 991836 10 2040 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 12345678910 1123456789 22468 1214161820 336912151821242730 44812 551015 661218 771421 881624 991827 10 2030 3- we double the number and then add one more set

8 12345678910 1123456789 22468 1214161820 336912151821242730 4481216202428323640 5510152025 6612182436 7714212849 8816243264 9918273681 10 203040100 Square numbers-make a diagonal on the number chart

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

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

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

14 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

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

16 12345678910 1123456789 22468 1214161820 336912151821242730 4481216202428323640 55101520253035404550 66121824303642485460 77142128354249566370 88162432404856647280 99182736455463728190 10 2030405060708090100 6x7; 6x8; 7x8= the ugly ones

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

18 1234567891011 11234567891011 2246810121416182022 33691215182124273033 448121620242832364044 5510152025303540455055 6612182430364248546066 7714212835424956637077 8816243240485664728088 9918273645546372819099 10 2030405060708090100110 11 2233445566778899110121 11—double the digit

19 123456789101112 1123456789101112 224681012141618202224 3369121518212427303336 44812162024283236404448 551015202530354045505560 661218243036424854606672 771421283542495663707784 881624324048566472808896 9918273645546372819099108 10 2030405060708090100110120 11 2233445566778899110121132 12 24364860728496108120132144 12

20 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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