4.2 Estimating Sums & Differences

Slides:

Advertisements

Similar presentations

Chapter 3 L3-4 Notes: Estimating Sums & Differences.

Advertisements

Percent Error The percent that an estimate varies from an actual amount.

Countdown Warm Up. Ten Minute Math LARGEST DECIMAL You will have 30 seconds to decide which decimal you think is the largest. Send your answer in on your.

Unit 2 Estimation and Computation. CFA: Unit 2 1. What digit is in the hundreds place? A. 5 B. 6 C. 3 D. 1.

Lesson 17.  Addends- The numbers that are being added together.  Reasonable- Does it make sense?

Estimating Sums and Differences of Whole Numbers.

Whole Numbers How do we use whole numbers to solve real-life problems?

Estimating Sums to the Nearest 10 and 100

Date: _____________Math 9/9H Place Value Which position is a digit of a number occupying? E.g.: is in the millions place 9 is in the hundred.

Chapter 7.5 Notes: Apply the Tangent Ratio Goal: To use the tangent ratio to determine side lengths in triangles.

$100 $200 $300 $400 $100 $200 $300 $400 $300 $200 $100 Estimate with pictures Round to nearest hundred Round to nearest thousand Add / subtract & estimate.

Bell Work Which number is twice as much as the square root of ten

5-Minute Check Round to the nearest whole number Round to the nearest tenth

Estimating Fractions.

Objective Students will be able to estimate sums and differences (3-5).

ALGEBRA 12.6 The Distance and Midpoint Formulas. The distance d between points and is: Find the distance between (–3, 4) and (1, –4). Why? Let’s try an.

My Hardest Math Concept

When estimating, 1.) You should be able to do the computation in your head 2.) Your answer should be close to the exact answer 1-1 Estimating sums, differences.

COURSE 2 LESSON Find , or 4 Estimate 21 Add the fractions. Add the whole numbers = Write.

Reverse Subtraction Objectives:  do a subtract by adding  check your answer by adding.

Warm Up Problems Round each decimal to the nearest whole number.

MENTAL MATH Rounding Addition and Subtraction Strategy: Estimate the answer by rounding each number to the nearest hundred Examples:

#1. #2 #3 #4 #5 Ruby is standing in her back yard and she decides to estimate the height of a tree. She stands so that the tip of her shadow coincides.

Adding and Subtracting Decimals.  Adding Decimals  Subtracting Decimals  Estimating While Adding or Subtracting Decimals  Solving problems by Adding.

Adding and Subtracting Decimals Section 5.2. Adding or Subtracting Decimals Step 1. Write the decimals so that the decimal points line up vertically.

Section 6.3. A ball flies through the air at a certain speed and in a particular direction. The speed and direction are the velocity of the ball. The.

Unit 2 Real World Problems and Estimation. Key Words Sum- Add Difference- Subtract Product- Multiply Quotient- Divide.

Estimating Sums to the Nearest 10 and 100 Copyright © 2013 Kelly Mott.

,000 Estimation Rounding Word Problems Math Vocabulary Miscellaneous ,000.

Do Now 1. Solve 2x+3>x+5 2. Solve - c - 11>23

Week 7 Name ____________________ 122,342 Day , ,291 Day 2

Rounding Numbers to the Nearest Hundred

Rounding Tens and Hundreds

ROUNDING 54 ______ 26 ______ 39 ______ 13 ______ 99 ______ 07 ______

Bell Ringer A seafood restaurant made 8.96 cups of clam chowder on Tuesday morning. At lunch, the restaurant sold 8.55 cups of the chowder. How much.

Adding & Subtracting Decimals

Objective 2 Days The learner will solve real-life problems using equations (d=r*t)

What is 423 rounded to the nearest hundred?

Warm Up Estimate by rounding to the nearest integer (–8.23) –

Estimation : Rounding When rounding numbers which are exactly in the middle, the convention is to round up rounded to the nearest 10 is Numbers.

Knowing your math operation terms

Objectives Chapter 1 Place Value Reading and Writing Whole Numbers

2nd period rd period th period th period

Rounding Numbers.

1.35 ÷ .005 Joke of the day: Tuesday Homework:

Lesson 7: Estimating Decimal Sums and Differences

Do now Homework: Lesson check 2-5 page 112

Rounding Review Tens and Hundreds

Rounding Review Tens and Hundreds

Do Now: 2. If tan (

Estimating With Decimals

Rounding Review Tens and Hundreds

Estimating Sums and Differences of Fractions and Mixed Numbers

Add or Subtract? x =.

7.4 Approximating Square Roots

Warm Up Problem of the Day Lesson Presentation Lesson Quizzes.

Point-Slope Form 11-4 Warm Up Problem of the Day Lesson Presentation

Lesson Quizzes Standard Lesson Quiz

Lesson Quizzes Standard Lesson Quiz

Solving Problems! By: Krysta Walthall.

Presentation transcript:

4.2 Estimating Sums & Differences

What are some things that are often rounded?

Target We will use rounding to estimate sums and differences.

Rounding Review! 5 or more, add one more! 4 or less, stay! 1,325 300 350 400

Vera went on a 3-day trip in which she traveled 336 miles the first day, 423 miles the second day, and 357 miles on the third day. Is 300 or 400 a more reasonable estimate for about how far she went on each of the days?

Rounded to Nearest Hundred Vera went on a 3-day trip in which she traveled 336 miles the first day, 423 miles the second day, and 357 miles on the third day. Vera’s Distances Miles Traveled Rounded to Nearest Hundred 1st day 2nd day 3rd day

When would you want to use an estimate instead of an exact answer? When you need to decide how many packages to buy when items are sold in certain quantities.

The Empire State Building was completed in 1931 The Empire State Building was completed in 1931. From ground to tip it measures 1,250. At the top of the building is a lightening rod which measures 204 feet. Estimate the total height of the building. Is the answer reasonable?

1. Write the numbers vertically (up and down). 2 1. Write the numbers vertically (up and down). 2. Decide which place to round to. Round each number. 3. Add or subtract the rounded numbers. 4. Check your answer for reasonableness.

The Washington Monument was completed in 1884 The Washington Monument was completed in 1884. About how many years after was the Empire State Building completed? 10

This is not reasonable!! How would rounding the dates to the nearest hundreds change the usefulness of the estimate?

You Try! Compare the years Illinois (1818) and Wyoming (1890) acquired statehood.

You Try! 5 6 3 + 3 7 5

You Try! 2 8 8 - 1 7 1

You Try! 6 4 5 + 2 5 3

You Try! 2 6 2 - 1 3 2

You Try! 9 5 2 - 4 0 2

You Try! 3 9 8 + 1 2 1

1. What are we studying today. 2. What did we learn. 3 1. What are we studying today? 2. What did we learn? 3. What are the steps?

1. Write the numbers vertically (up and down). 2 1. Write the numbers vertically (up and down). 2. Decide which place to round to. Round each number. 3. Add or subtract the rounded numbers. 4. Check your answer for reasonableness. Pg 94 - #9-12, 17, 18, 23, 24, 27, 29 CHALLENGE: Pg. 95 # 25