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Multiplication Srategies

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by

Ryan Luu

on 14 September 2016

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Transcript of Multiplication Srategies

Multiplication Strategies
2 facts are a double of a 4 fact
Make Groups
3x5
Make Arrays
6x6
Skip Counting
6, 12, 18, 24, 30, 36, 42, 48, 54, 60
By:
Dean

&

Ryan

. . . . .
. . . . .
. . . . .
15
Three groups of five (3x5)
equals fifteen
: : : : : :
: : : : : :
: : : : : :
count the dots and then you will get the answer or just look under
36
6x1=6 6x2=12 6x3=18 6x4=24 6x5=30
6x6=36 6x7=42 6x8=48 6x9=54 6x10=60
This is skip counting
This is multiplication
There almost the same thing
Patterns
in
Digits
Use a Multiplication chart
8x1=
8
8x2=1
6
8x3=2
4
8x4=3
2
8x5=4
0
8x6=4
8
8x7=5
6
8x8=6
4
8x9=7
2
8x10=8
0
The pattern is in the ones digit. It goes 8, 6, 4, 2, 0 and it repeats.
Step 1 How to use a multiplication chart.
First you find a top number and then you find a side number only in the black
Step 2 Line up the two numbers so you go down with to top number and go right with the side number
8x6=48
9 products will always add up to 9
9x2=18, 9x3=27, 9x4=36, 9x5=45, 9x6=54, 9x7=63, 9x8=72, 9x9=81
9 products will always add up to 9 OK!
This is how you can know that this is a 9 fact 1+8=9,2+7=9,3+6=9,4+5=9,etc
Ten products always have a 0 at the end
10x1=1
0,
10x2=2
0,
10x3=3
0,
10x4=4
0,
10x5=5
0,
10x6=6
0,

10x7=7
0,
10x8=8
0,
10x9=9
0,
10x10=1
00!
every end digit is 0!!!
Patterns in the 9's
9x2
=
1
8
9x3=
2
7
9x4
=
3
6
9x5
=
4
5
9x6=
5
4
9x7
=
6
3
9x8
=
7
2
9x9
=
8
1
The Green digit goes up and the pink digit goes down.
14
28
Full transcript