Katrina is building a wall around her backyard using bricks that are 18 inches long. The wall needs to be 36 feet, or 432 inches, long. She determines that she will need exactly 23 bricks for each row, as shown by her calculations below.

Question

18 StartLongDivisionSymbol 432 EndLongDivisionSymbol minus 36 = 72. 72 minus 72 = a remainder of 0 and a quotient of 23.

What error did Katrina make in her calculations?
There is a subtraction error. Each row will need 22 bricks.
There is a subtraction error. Each row will need 24 bricks.
There is a division error. Each row will need 22 bricks.
There is a division error. Each row will need 24 bricks.

Answer 1

To determine the number of bricks needed for each row, we need to perform the division correctly.

Katrina needs to find out how many 18-inch bricks are needed to cover a total length of 432 inches.

We have:

• Total length of the wall = 432 inches
• Length of each brick = 18 inches

To find the number of bricks, we perform the division:

\[ 432 \div 18 = 24 \]

Thus, Katrina actually needs 24 bricks for each row.

Katrina's calculation stating that she needs 23 bricks is incorrect and was a result of a division error.

The correct answer is: There is a division error. Each row will need 24 bricks.