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Take out your pencil, QTD sheet and H.W. (Redbook 1-1). Get started on the QTD. PowerPoint Presentation

Take out your pencil, QTD sheet and H.W. (Redbook 1-1). Get started on the QTD.

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Take out your pencil, QTD sheet and H.W.

(Redbook 1-1).

Get started on the QTD.

Is anyone absent at your table? Can you fill out an absent slip for them?

Find the sum for:

1.) 16 + 19

2.) 8,589 + 6,867

3.) 1,275 + 863

4.) 18,956 + 24,460

QTD for

lesson 1-2

ANSWERS for QTD:

Find the sum for:

1.) 16 + 19

2.) $8,589 + $6,867

3.) 1,275 + 863

4.) 18,956 + 24,460

Your answers are great but in a minute I am going to change the directions…

Anyone have the answer for #1?:

1.) 35

2.) 15,456

3.) 2,138

4.) 43,416

Thumbs up if you got all 4 questions correct!!

Today’s Goal:Estimate with whole numbers

By the end of class today you will learn:

- To estimate with whole numbers.
- When to estimate and when to round.
- Did I overestimate or underestimate?
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

T.O. ** ANSWER THIS QUESTION** Is rounding the same or different from estimating? Explain your answer.

Let’s round some numbers:

- RULES: Pay attention to the place value indicated.
- 5 or higher, round the number to the left up one OR
- Less than 5, leave the number to the left the same
- LET’S PRACTICE:
Thumbs up if you round up,OR thumbs down if you keep it the same.

HINT: Mrs. Nelson, tell them what place to round to. (Look at the chart above for help)

- (overestimate or an underestimate?)
- 5,789 451 4,907 15,298 * 45,999
- Work on 1-2 reteach, we’ll go over it in 2 minutes.

NEW DIRECTIONS for the QTD:

1.) Mrs. Nelson invited 12 girls and 19 boys to a party. About how many plates did she need to buy?

Why is an exact answer NOT needed?

HINT: Do they sell packages of 31 in the store?

ROUND the number of plates needed..

16 ~ _____ 19 ~ _____

Your answer is…? ____35___

Is this (35) an exact answer? Explain how you know.

The EXACT answer is 31.

Your answer of 35 is called an ESTIMATE. You rounded the number of plates to find about how many I needed, that’s called an estimate.

You _______ numbers, __________ are answers.

round estimates

Try this with your partner

Anthony has $8,589 in the bank and Jacob has $6,867 in the bank. They want to put their money together to buy a sports car. About how much money do they have?

With your partner:

1.) Find the answer to the question:

2.) Should the answer you found be exactly how much they have or an estimate? Explain.

3.) What are your rounded #’s?: _____________

your estimated #’s?: ____________

How did you know what to do? or what to round to?

THINK AND DISCUSS:

- Discuss your answer with another group. Same/Different?
- How many different answers could you have to this problem? Why that many?
- Would one answer be MORE correct then another?

- Compare each answer to the exact answer, what do you notice?
- This is called an OVERESTIMATE. What does that mean? How is possible that they are all over the exact answer?

Ticket Out: 2.) Is rounding the same or different from estimating? Use the example above to support your answer. Homework: Textbook page 12 #6-15 on a separate sheet of paper.Show your work!

- 1.) Estimate each sum by rounding to the tens place.
- 10,892 + 4,821=
- Answer is: 10,900 + 4,800= 15,700

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