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lATTiCE MulTiPliCATion

Finding the product using the lattice multiplication method is fun! It is a very interesting
method.

Multiplying by a 1-digit number

Example 1. Find 73 × 4 using the lattice multiplication method.

Solution.

Step 1. Write the two numbers in the Step 2. Draw the diagonal of each cell
form of a table as shown. as shown.

7 3 Multiplicand 7 3

4 Multiplier 4

Step 3. Multiply 3 by 4, and write the Step 4. Multiply 7 by 4, and write the
product in the lattice below 3 product in the lattice below 7
as shown. as shown.

7 3 7 3
1 4 2 1 4

2 8 2

Step 5. Add the digits along the diagonals as shown. 7 3
The answer is read from left to right. 2 1
Product = 292 2 8 2 4

Therefore, 73 × 4 = 292. 9 2

Example 2. Find 143 × 7 using the lattice multiplication method.
1 4 3

Solution. 0 2 2 7

1 7 8 1 Use regrouping while
0 0 1 adding the digits.
Therefore, 143 × 7 = 1001.
Example 3. Find 2436 × 5 using the lattice multiplication method.

2 4 3 6

Solution. 1 2 1 3 5

1 0 0 5 0
2 1 8 0
Therefore, 2436 × 5 = 12180.

52 Mathematics 4