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

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:.

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(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

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?

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

• 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.

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 ~ _____

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

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

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?

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?: _____________

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

• 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?

• 1.) Estimate each sum by rounding to the tens place.

• 10,892 + 4,821=

• Answer is: 10,900 + 4,800= 15,700

• 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!