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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10
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10
2-double the original
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10
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12
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20
4- we double the number than double again!
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36
40
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5
10
20
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24
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28
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16
32
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9
18
36
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40
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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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30
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12
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15
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12
18
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7
14
21
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8
16
24
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9
18
27
10
10
20
30
Square numbers-make a diagonal on the number chart
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40
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5
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25
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6
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18
24
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21
28
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8
16
24
32
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9
18
27
36
10
10
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40
36
49
64
81
100
Also
• 11x11=121
• 12x12=144
• Try 13x13=____
10-just add a zero
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32
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36
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80
81
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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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5
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6
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24
30
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35
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32
40
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9
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27
36
45
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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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10
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5
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50
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6
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30
36
54
60
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7
14
21
28
35
63
70
8
8
16
24
32
40
64
72
80
9
9
18
27
36
45
54
63
72
81
90
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100
49
9s
• If 9x4=36 (10x4-4)
• Then 9x43= ____ (10x43-43)
• Try 9x290=________
• Try 9X365=________
6x7; 6x8; 7x8= the ugly ones
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60
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63
70
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48
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72
80
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63
72
81
90
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100
The ugly ones
• 6x7=42 (e.g. 6x7=(6x6)+(6x1))
• 6x8=48
• 7x8=56
11—double the digit
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55
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66
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77
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48
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64
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88
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63
72
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90
99
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100 110
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88
99
110 121
12
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12
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36
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48
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60
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6
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42
48
54
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66
72
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7
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28
35
42
49
56
63
70
77
84
8
8
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24
32
40
48
56
64
72
80
88
96
9
9
18
27
36
45
54
63
72
81
90
99
108
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100 110
120
11
11
22
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44
55
66
77
88
99
110 121
132
12
12
24
36
48
60
72
84
96
108 120 132
144
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