Question

Using lattice multiplication method, find the total cost of all the beads given in the table above.

• A. $3,869
• B. $3,769
• C. $3,969
• D. $3,069

Answer 1

The correct option is C $3,969


Number of yellow beads = 8
Number of green beads = 7
Number of red beads = 6

$\text{∴ Total number of beads}=8+7+6=21$

$\text{Cost of 1 bead}=\$189$
$\text{∴ Cost of all the beads}=\$189\times 21$

Step 1: Draw a 3x2 table and on top and right, just put the digits:

Step 2: Draw the diagonals and write the digits in the boxes:


Step 3: Add the digits along the diagonal and write them from the left side to the right side:


So, the cost of all the beads in the table is $3,969.