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

Division and multiplication have to be calculated before any addition/subtraction.

Answer 2

Also, where did the 9 come from in step 2?

Answer 3

im not sure ... thats what the question said. >.<

Answer 4

Her mistakes are:

In step 2 she put a 9 where she should have left the 32. In step 3 she did addition before division. Her steps should look like this:

Answer 5

Step 1: 12 / 3 + 2 + 32 * 6
Step 2: 4 + 2 + 32 * 6
Step 3: 4 + 2 + 192
Step 4: 198

Answer 6

Step 1: Parenthesis first
Step 2: Division and multiplication next from left to right
Step 3: Division and multiplication next from left to right
Step 4: Addition

Answer 7

thanks! :D