Transcript Two Digit by Two Digit Multiplication - tbennet2-Medt

Two Digit by Two Digit
Multiplication
Tiffany Bennett
3rd Grade: Common Core
Oh, No you have come across a
difficult problem…
45
32
X
One method to
solve this
problem is to
“Clean House
and Make
Momma Happy!”
First… you want to pretend that
you are doing two digit by one digit
multiplication. I like to cover the
digit.
45
32
X
Second… Follow the steps when
multiplying. Two X Five is Ten, so you
would write the zero and carry your
one.
1
45
X32
0
Next Multiply two and four to get
eight. Don’t forget to add the one.
1
45
X32
90
Now we clean
house!
You will ALWAYS
place a zero in the
ones place when
moving on to the
tens place. But first,
you want to erase
the numbers you
carried.
45
X32
90
0
Since we made Momma Happy we
need to add a smiley face to our
zero!
45
X32
90
0
We can now move on to the tens
place.
45
X32
90
0
First we will multiply three and five
to get fifteen. The five will go below
the nine and carry the one.
1
45
X32
90
50
Next we
will multiply
the four and
three to get
twelve.
Don’t forget
to add your
one.
1
45
X32
90
13 50
Now add your two
sums to get the
product!
1
45
X32
90
+ 13 50
You now have your final answer!
45
X32
1,440
Credits
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