Topic 2-4 Subtract Whole Numbers

Topic 2-4 Subtract Whole Numbers

Let's Review What We Know First

Multiple Select

What do we call a set of three numbers, side-by-side, in the ones-tens-hundreds places?

• place value

• rounded numbers

• period

Fill in the Blank

An _________ is a set of steps used to solve a math problem.

In today's lesson, we will:

Use place value and an algorithm to subtract whole numbers.

Today we will be borrowing from our neighbor in order to subtract.

Remember, you are subtracting the bottom number FROM the top number.

Solve & Share Question

Take time to try this problem and then come back

(to class / to our Zoom call / etc.):

A crayon company makes 87,491 blue crayons, 36,262 red crayons, and 25,063 gray crayons. How many more blue crayons are made than red and gray crayons combined?

White board demonstration

Before we solve this, let's estimate the difference.

Round to the thousands.

Multiple Choice

What is 362,839 rounded to the thousands place?

• 362,000

• 363,000

• 362,800

• 362,900

Multiple Choice

Estimate 363,000 - (81,000 + 112,000)

• 171,000

• 169,500

• 169,000

• 170,000

Multiple Choice

How many more people actually attended the street fair in 2016 than in 2014 and 2015 combined?

• 169,533 people

• 169,540 people

• 169,538 people

• 170,008 people

Poll

What is another way to check our subtraction work?

• Use Inverse Operations (add)

• Check a classmate's answers

• Have dad check

  my work

• Ask my teacher

  if I am right

When you complete your practice buddy, make sure you read the directions.

You will be asked to check your work with inverse operations and you will be asked to use estimates. Read carefully.