Multiplication

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Transcript Multiplication

Multiplication
Multiplication
Multiplying by 0’s
Anything x a cheerio = a cheerio
Example:
45 x 0 = 0
0x5=0
1,890 x 0 = 0
Multiplying by 1’s
When you look in the mirror what do you see? I
see a number looking back at me.
The mirror
is the one!
Example
5x1=5
345 x 1 = 345
Multiplying by 2’s
When multiplying by 2’s
you circle the other number
and double it.
Example
4x2=8
8 x 2 = 16
2 x 7 = 14
Multiplying by 3’s
3, 6, 9,…12, 15, 18,…21, 24, 27,…30
Multiplying by 4’s
You have to be 16 to
drive a 4 by 4.
4 x 4 = 16
• What two numbers come
before 3 and 4 ____ _____
• 3 x 4 = 12
3 of the fours you have to
memorize
• 4 x 6 = 24
• 4 x 7 = 28
• 4 x 8 = 32
Multiplying by 5’s
When multiplying by 5 pretend that
a 5 is in the center of the clock. So if
5 is in the center and the long hand is
on the 4…it is 20 after.
If the long hand is on the 8 it is 40 after.
Multiplying by 6’s
A little girl lived in
Clinton and a little
boy lived in Vicksburg.
They loved to talk on the
phone. From Clinton to
Vicksburg it is 36 miles.
There is a 6 story
building and a 7 story
building and they are
located on 42nd street in
New York city.
6 x 6 = 36
The 6 looks like a
phone.
6 x 7 = 42
Multiplying by 7’s
There was a football player
who in high school was all
state. He wore the number 7.
He went on to play in
college and won the Heisman.
He continued to wear the
number 7.
After graduating from college
he was drafted into the pros
by the San Francisco 49ners.
7 x 7 = 49ners
• What 2 numbers come
before 7 and 8 ____ _____
• 7 x 8 = 56
Multiplying by 8’s
He eight and eight and
got sick on the floor. The
answer is 64.
8 x 8 = 64
Multiplying by 9’s
TRICK 9
Example:
9 x 5 = Trick 9…take one away
from 5 is 4…9 - 4= 5…45
9 x 8 = Trick 9…take one away
From 8 is 7…9 – 7 = 2…72
Multiplying by 10’s
When multiplying by 10’s
the one sees itself and the
zero is a cheerio!
Example
5 x 10= the one sees a 5 and
put down a cheerio = 50
Multiplying by 11’s
When multiplying by 11 you are seeing doubles. Ex. 5 x 11 =55