Topic 2-3 Add Whole Numbers

Topic 2-3 Add Whole Numbers

Today's Lesson will teach us:

How to add numbers to one million with and

without regrouping using the standard algorithm.

Vocabulary

An algorithm is a set of steps used to solve a problem.

Vocabulary

Operations that can undo each other are inverse operations.

Multiple Choice

What is the inverse operation for the addition problem 239 + 751?

• 751 + 239 = 990

• 990 - 731 = 239

• (239 + 751) = (751 + 239)

• 751 + 9 + 30 + 200 = 990

Solve & Share Question

Take time to try this problem and then come back

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

Erica's class collected 4,219 bottles for the recycling center. Ana's class collected 3,742 bottles. Leon's class collected 4,436 bottles. How many bottles did the three classes collect altogether?

White board demonstration

Before we solve this one, let's ESTIMATE the answer.

Round to the hundreds place first.

Multiple Choice

What is the estimate we are adding for the insects and spiders questions. Remember, round to the hundreds BEFORE you add.

• 7,800 + 4,900

• 7,836 + 4,900

Return to Whole Group / Zoom Call

What is 7,800 + 4,900?

Multiple Choice

How many species did the volunteers catalog?

• 12,758 species

• 13,728 species

• 12,700 species

• 11,728 species

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

You will estimate then you will find the actual sum.