Multiplying Whole Numbers
Lesson 2-2
Example: 563 x 37
56337x
1
2
4
4
39098
1
16+13
1
8
1
0
1
2
Example: 53 x 26182618 has more digits (4) than 53 (3), so it goes on top.
2618 53x
4
2
58
1
700
4
90
3
13+
457
1
831
Lattice MultiplicationStep-by-Step
356 x 25 =I don’t
remember how to multiply!!!
HELP!!! I can help!! Let me show you how to
do Lattice Multiplication.
356 x 25
3 5 6
2
5
Make a grid the exact size of your problem. A 2 digit number times a 3 digit number gets a 2 x 3 grid. Draw a diagonal line in each box.
356 x 25
3 5 6
2
5
12
Multiply 6 * 2 and place the answer in the grid where the lines meet.
356 x 25
3 5 6
2
5
120
1
Multiply 5 * 2 and place the answer in the grid where the lines meet.
356 x 25
3 5 6
2
5
120
16
0
Multiply 3 * 2 and place the answer in the grid where the lines meet. Use a zero as a place holder.
356 x 25
3 5 6
2
5
120
16
0
03
Multiply 6 * 5 and place the answer in the grid where the lines meet.
356 x 25
3 5 6
2
5
120
16
0
03
Multiply 5 * 5 and place the answer in the grid where the lines meet.
52
356 x 25
3 5 6
2
5
120
16
0
03
Multiply 3 * 5 and place the answer in the grid where the lines meet.
52
51
356 x 25
3 5 6
2
5
120
16
0
03
Now add the diagonals and place the answer below the grid. Be sure to carry to the next diagonal if you have a 2 digit answer.
52
51
0
356 x 25
3 5 6
2
5
120
16
0
03
Now add the diagonals and place the answer below the grid. Be sure to carry to the next diagonal if you have a 2 digit answer.
52
51
00
+1
356 x 25
3 5 6
2
5
120
16
0
03
Now add the diagonals and place the answer below the grid. Be sure to carry to the next diagonal if you have a 2 digit answer.
52
51
00
+1
9
356 x 25
3 5 6
2
5
120
16
0
03
Now add the diagonals and place the answer below the grid. Be sure to carry to the next diagonal if you have a 2 digit answer.
52
51
00
+1
98
356 x 25
3 5 6
2
5
120
16
0
03
Now add the diagonals and place the answer below the grid. Be sure to carry to the next diagonal if you have a 2 digit answer.
52
51
00
+1
98
356 x 25 =8,900
Which method do you prefer?
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