Grade 3 Math Unit 3 Addition and Subtraction of Whole Numbers

Multiple Choice

What value does the square symbol represent?

Choose the correct addition sentence.

5▣ + ▣5= 100

• 50 + 55 = 100

• 55 + 55 =100

• 55 + 45 = 100

• 50 + 05 = 100

Fill in the Blanks

​450

Fill in the Blanks

​450

​200

Fill in the Blanks

​450

​200

400

Fill in the Blanks

​450

​200

400

300

​Four Math Operations: Add, Subtract, Multiply, Divide

Multiple Choice

What math operation do we use to make the number sentence true?

28 ◉ 72 = 100

• add

  +

• subtract

  -

• multiply

  x

• divide

  ÷

Multiple Choice

What math operation do we use to make the number sentence true?

55 =70 ◉ 15

• add

  +

• subtract

  -

• multiply

  x

• divide

  ÷

Multiple Choice

What math operation do we use to make the number sentence true?

25 = 22 ◉ 3

• add

  +

• subtract

  -

• multiply

  x

• divide

  ÷

Multiple Choice

What math operation do we use to make the number sentence true?

100 ◉ 85 = 15

• add

  +

• subtract

  -

• multiply

  x

• divide

  ÷

Multiple Choice

What math operation do we use to make the number sentence true?

500 = 370 ◉ 130

• add

  +

• subtract

  -

• multiply

  x

• divide

  ÷

​double ▣ + ⟁ = ◉

​

​        2 x 5 + 2 = 12

​double ▣ + ⟁ = ◉

​

​        2 x 25 + 5 = ◉

Fill in the Blanks

Fill in the Blanks

Poll

What can you do?

• I can find a missing number represented by a symbol.

• I can find a missing operation sign represented by a symbol.

• I need more practice with the Workbook and Live Worksheets.

​Lesson 3-4

How to Solve Addition and Subtraction Problems Efficiently (quickly and easily)

​1. Estimate

​2. Decompose

​3. Complete operation (+ - ) by place value

​4. Compose

First, make an estimate.

​Round up or down to make the numbers easier to think about.

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Multiple Choice

What is a good estimate for 

235 + 174

• 200 + 200

  about 400

• 300 + 200

  about 500

• 200 + 100

  about 300

Multiple Choice

What is a good estimate for 

459 - 318

• 500 - 400

  about 100

• 500 - 300

  about 200

• 400 - 300

  about 100

Multiple Choice

What is a good estimate for 

424 - 179

• 500 - 100

  about 400

• 500 - 200

  about 300

• 400 - 200

  about 200

Next, decompose the numbers.

Break apart the numbers by place value

Fill in the Blanks

Fill in the Blanks

Then, complete the operation.

Finally compose the parts.

​How to Solve Addition and Subtraction Problems Efficiently (quickly and easily)

​1. Estimate

​2. Decompose

​3. Complete operation (+ - ) by place value

​4. Compose

Fill in the Blanks

*Sometimes you need to regroup before you can subtract.

Fill in the Blanks

Multiple Choice

Asif needs 355 chairs for a concert.

He has 269 chairs already.

What operation will we use?

• add

• subtract

• multiply

• divide

Fill in the Blanks

Fill in the Blanks

Multiple Choice

What operation will we use?

• add

• subtract

• multiply

• divide

Fill in the Blanks

Poll

What can you do?

• I can choose quick and easy steps to add or subtract whole numbers.

• I can estimate the size of an answer before I calculate.

• I can accurately solve addition and subtraction problems.

• I need more practice with the Workbook and Live Worksheets.