Transcript Learn Multiplication Standard Algorithm

Seek The
Multiplication Treasure
2009-2010
Copy this problem. Multiply the
factors in the top row by the digit in
the ones place in the second factor.
342
x 23
1
342
x 3
1026
Since 4 • 3=12 Carry the 1
and
write 4
down
Multiply
Multiply
Multiply
•33 ••the
23 +2 1
Now you will multiply the top factor
by the tens digit in the second factor.
In this problem, you multiply by the
2 in the tens place or 20.
342
x 23
342
x 23
1026
Since the 2 actually represents 2 tens or 20,
we will want to put a zero in the ones place
in the second row of our work before we
multiply anything else.
342
x 23
342
x 23
1026
0
Multiply the 2 times every digit in the top
factor and write the answer in the second
row below the line.
342
x 23
342
x 23
1026
6 84 0
To check to see if you are ready to add,
count the number of digits in the second
factor.
342
x 23
There are two
digits in the
second factor.
342
x 23
1026
6 84 0
Since there are two digits in the second
factor there should be two rows of numbers
to add to get the product.
342
x 23
There are two
digits in the
second factor.
342
x 23
1026
6 84 0
one
two
Since the number of digits matches the
number of rows, we now add the rows
together to get the product of the original
problem.
342
x 23
There are two
digits in the
second factor.
342
x 23
1026
+ 6 84 0
one
two
Since the number of digits matches the
number of rows, we now add the rows
together to get the product of the original
problem.
342
x 23
342
x 23
1026
+ 6 84 0
7866
Work the following problem following the
steps used in the previous problem.
914
x 48
Work the following problem following the
steps used in the previous problem.
1
914
x 48
7312
+ 36560
43,872
Work the following problem following the
steps used in the previous problem.
55
66
767
x 89
6903
+ 61360
68,263
Are you up to the adventure of
finding the multiplication
treasure? Remember X
(multiplication) marks the spot!
Choose from the following problems, at least two from
each column. Solve them on Multiplication Graph
Paper and pass in to your teacher. (Don’t forget to write
your name on your paper.)
•
•
•
•
•
32 X 26
28 X 18
46 X 22
53 X 34
125 X 23
•
•
•
•
•
532 X 16
208 X 58
246 X 31
53 X 344
2,125 X 24
To Review the Demonstration
again, click on the Treasure
Chest.