IXL | Identify mistakes involving the order of operations

Emilia tried to evaluate the expression

–

Here is her work:

–

Step 1

–

Step 1

Step 2

Step 3

Is Emilia's work correct?

No, Emilia made a mistake in Step 1. Emilia should have subtracted first. The order of operations says to work from left to right.

No, Emilia made a mistake in Step 2. Emilia should have added before she subtracted. The order of operations says to add before you subtract.

Yes, Emilia's work is correct.

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question

Devin tried to evaluate the expression

Here is his work:

Step 1

Step 2

Step 3

Is Devin's work correct?

No, Devin made a mistake in Step 1. Devin should have divided before multiplying. The order of operations says to multiply and divide from left to right.

No, Devin made a mistake in Step 1. Devin should have added before multiplying. The order of operations says to work from left to right.

Yes, Devin's work is correct.

key idea

To evaluate an expression, you can follow the order of

operations:

Perform operations inside parentheses and brackets. Start with parentheses and do brackets next.
Multiply and divide from left to right.
Add and subtract from left to right.

solution

Devin made a mistake in Step 1. Devin multiplied before he divided.

The order of operations says to multiply and divide from left to right. So, Devin should have divided before he multiplied. This shows the work Devin should have done:

Divide

Multiply

Add

Looking for more? Try these:

Lesson: Order of operations

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Teacher tools

Work it out

Not feeling ready yet? These can help:

H.5Evaluate numerical expressions with parentheses and brackets

Lesson: Order of operations

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