Dierdre's work to solve a math problem is shown below. Problem: How many 1 1/2- foot pieces can be cut from a 12-foot length of a ribbon?

Question

Step 1: 1 1/2 divide by 12 = n

Step 2: 3/2 divide by 12 = n

Step 3: 3/2 X 1/12 = n

Step 4: 3/24 = n

Answer: 1/8 = n

What was Dierdre's first error?

A. She switched the divisor and the dividend in step 1 when creating an equation to model the problem.

B. She used an improper fraction in step 2 that is not equivalent to 1 1/2.

C. She replaced the divisor by its reciprocal in step 3 instead of re[;acing the dividend by its reciprocal.

D. She reduced the fraction in step 4 incorrectly.

Answer 1

Dierdre's work to solve a math problem is shown below. Problem: How many 1 1/2- foot pieces can be cut from a 12-foot length of a ribbon?
Step 1: 1 1/2 divide by 12 = n
Step 2: 3/2 divide by 12 = n
Step 3: 3/2 X 1/12 = n
Step 4: 3/24 = n
Answer: 1/8 = n
What was Dierdre's first error?
A. She switched the divisor and the dividend in step 1 when creating an equation to model the problem.
B. She used an improper fraction in step 2 that is not equivalent to 1 1/2.
C. She replaced the divisor by its reciprocal in step 3 instead of re[;acing the dividend by its reciprocal.
D. She reduced the fraction in step 4 incorrectly.

Her first error was A. She switched the divisor and the dividend in step 1 when creating an equation to model the problem.

Answer 2

A. She switched the divisor and the dividend in step 1 when creating an equation to model the problem.