Transcript Slide 1

It’s time for Math
Class
Today we are
going to be
working on 2-digit
by 2-digit
multiplication.
Yuk Math…I’m out
of here!
Let’s start with a quick
review!
• What is multiplication?
• What is a factor?
• What is a product?
• Why should I care?
Now how
do I solve
this
problem?
6 X 5=
Boy, am I in trouble I don’t have
Enough fingers to solve this
problem.
What on Earth am I going to do?
6 X 5=
I know just the
person to ask for
help on solving this
problem. My friend
Handy Andy!
Hi Goofy
What’s up?
I’m having big
problems with
multiplication. Can
you help me out?
Absolutely!
That’s what
friends are for!
Let’s see the
problem and
get started.
6 X 5=
Here’s the
problem but I
don’t know
what to do?
6 X 5=
That’s easy Goofy! Watch me
solve it. I have 6 arms. On
each arm I have a hand with 5
fingers so I can count by fives
6 times. Count with me!
5,10,15,20,25,and 30
15
20
25
10
So 6 X 5 = 30
See that was easy!
Anything else you need help
with?
5
30
I wonder if Handy Andy
Can do
2-digit multiplication too?
WOW! That was
easy for him to do
he’s so SMART!!!
23 x 45 = ?
26
X 35
Hey Handy Andy do
you know how to do
2-digit by 2 digit
multiplication? I’m
having some
troubles with those
too!
Of course I do
Goofy! I’ll show
you how in 6 easy
steps. One step
for every one of
my hands.
6 Easy Steps to 2-Digit by 2-Digit
Multiplication
23
X 45
15
• Step 1: multiply 5 x 3
and write it down.
• Go to Step 2.
23
X 45
15
100
• Step 1: multiply 5 x
3 and write it down.
• Step 2: multiply 5 x
20 and write it down.
• Go to Step 3.
23
X 45
15
100
120
• Step 1: multiply 5 x
3 and write it down.
• Step 2: multiply 5 x
20 and write it down.
• Step 3: multiply 40 x
3 and write it down.
• Go to Step 4.
23
X 45
15
100
120
800
• Step 1: multiply 5 x
3 and write it down.
• Step 2: multiply 5 x
20 and write it down.
• Step 3: multiply 40 x
3 and write it down.
• Step 4: multiply 40 x
20 and write it down.
• Go to Step 5.
23
X 45
15
100
120
+ 800
1035
• Step 1: multiply 5 x 3
and write it down.
• Step 2: multiply 5 x 20
and write it down.
• Step 3: multiply 40 x 3
and write it down.
• Step 4: multiply 40 x 20
and write it down.
• Step 5: add all the
numbers up.
• Go to Step 6.
23
X 45
15
100
120
+ 800
1035
• Step 1: multiply 5 x 3
and write it down.
• Step 2: multiply 5 x 20
and write it down.
• Step 3: multiply 40 x 3
and write it down.
• Step 4: multiply 40 x 20
and write it down.
• Step 5: add all the
numbers up.
• Step 6: check your
work carefully.
Now that
wasn’t so
bad was
it?
It’s really
easy when
you know all
your Facts!
Now go practice some on your own!
GOOD LUCK!