Question

Kristina’s work to simplify the expression 12 ÷ 3 + (7 – 5) + 32 • 6 is shown below. Did Kristina make a mistake? If so:

Part 1: Explain where she made her mistake.

Part 2: Simplify the expression correctly to tell what her answer should have been.

Expression: 12 ÷ 3 + (7 – 5) + 32 • 6

Step 1: 12 ÷ 3 + 2 + 32 • 6

Step 2: 12 ÷ 3 + 2 + 9 • 6

Step 3: 12 ÷ 3 + 11 • 6

Step 4: 4 + 11 • 6

Step 5: 4 + 66

Answer: 70

Answer 1

Well, from Step 1 to Step 2 there is a transposition error (the 32 became a 9)
In Step 3, 2+9*6 is not equal to 11*6.