Operations and Algebraic Thinking

Where can we put parentheses in

45 - 22 + 9

to make it equivalent to 14?

• (45 - 22 + 9)

• (45 - 22) + 9

• 45 - (22 + 9)

• No parentheses needed

Evaluate the expression

( 7 × 4) − ( 2 + 8)

.

• 12

• 18

• 36

• 17

Kirsten tried to evaluate the expression
{12×2−8}×2
Where did she make a mistake at?  Her work is below.

{12×2−8}×2

Step 1: = {12×2} - 16

Step 2: = 24 - 16

Step 3:​ =8​

• Step 1

• Step 2

• Step 3

• no mistakes

Where can we put parentheses in

60÷10×3

to make it equivalent to 2?

• No parentheses

Evaluate the expression

{ 10 × 7} + (10 − 6)

.

• 164

• 280

• 32

• 74

Becca tried to evaluate the expression

45 − ( 8 × 3 + 15)

Her work is below.

​=45−(8×3+15)

Step 1: 45 - (24 + 15)

Step 2: = 45 - 39

Step 3: = 6

In Which step did she make a mistake?

• Step 1

• Step 2

• Step 3

• No mistakes

Where can we put parentheses in

19−3×5

to make it equivalent to 80?

• no parentheses needed

Evaluate the expression

2×(3+1)+2

• 9

• 10

• 8

• 12

John tried to evaluate the expression

30+{15−2×3}

His work is below.

​=30+{15−2×3}

Step 1: =30+{15-6}

Step 2: =30+9

Step 3:=39

=30+{15−6}

=30+9

=39

​

His work is below.

• Step 1

• Step 2

• Step 3

• No mistakes made

Which expression is

12 times as large as the expression 7 + 91?