[Student Name] [Current Date]

Slides:

Advertisements

Similar presentations

Multiplying Decimals Multiplying decimals is similar to multiplying whole numbers. The difference is that we place a decimal point in the product

Advertisements

Rounding Off Stage 4 Years 7 & 8 Press Ctrl-A ©2009 G Dear – Not to be sold/Free to use.

Estimation and checking answers.. What you should already be able to do: Round to the required number of decimal places. Round to the required number.

Significant Figures.  All measurements are inaccurate  Precision of measuring device  Human error  Faulty technique.

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.

Working with Significant Figures. Exact Numbers Some numbers are exact, either because: We count them (there are 14 elephants) By definition (1 inch =

How many significant figures?

LI: I can round numbers in a calculation to help me estimate the answer to the calculation Steps to Success… Be able to round a number to the nearest 10.

Let’s estimate when we multiply decimal fractions! This is one way to check our products.

6 x 99 Think: round off 99 to 100 So… 6 x 99 becomes 6 x 100 = 600 Then subtract: 600 – 6 = x 79 4 x 80 = 320 – 4 = 316.

Multiply Decimals 1.Multiply as with whole numbers. 2.Count the total numbers in decimal place value for both factors 3.Place as many numbers of your FINAL.

Do Now: (3 minutes) 1. What are the definitions of precision and accuracy? 2. Why are precision and accuracy important when making measurements?

Chemistry 100 Significant Figures. Rules for Significant Figures  Zeros used to locate decimal points are NOT significant. e.g., 0.5 kg = 5. X 10 2 g.

SWBAT describe the difference between exact & approx. values using rounding, significant figure, estimation and % error in writing by completing a set.

Chapter 2 Lesson 3.

Math 5 Multiplication: 2-digit x 2-digit

.  Often times we do not want to sit and calculate the solution to a problem because it might not be worth our time.  For example, suppose I went to.

Estimation Strategies Strand 1: Concept 3 PO 1. Solve grade level appropriate problems using estimation. Strand 1: Concept 3 PO 2. Use estimation to verify.

Long Division. We are going to try to solve 837 ÷ 27.

Rounding and Estimating Rounding a whole number means approximating it. Section 1.4.

Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall. 1.4 Rounding and Estimating.

to the Hundred Thousands

1.Is it More, Less, or Exactly Half? 2. Is it More, Less, or Exactly Half?

10’s 100’s and 1,000 th ’s place!. Rounding makes numbers that are easier to work with in your head. Rounded numbers are only approximate. An exact answer.

Estimation Great Marlow School Mathematics Department.

SIGNIFICANT FIGURES AND DECIMAL PLACES

Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall. 5.2 Adding and Subtracting Decimals.

Unit 2.2 Dividing Fractions!!!!. 2.7 Dividing Fractions Objectives Slide Find the reciprocal of a fraction. 2.Divide fractions. 3. Solve application.

Math 5 Division (2 digit divisor) Instructor: Mrs. Tew Turner.

$100 $200 $300 $400 $100 $200 $300 $400 $300 $200 $100 Multiply by 1 digit numbers Multiply & estimate results Multiply by 2 digit numbers Multiply.

Scientific Notation for big numbers ex = x places single digit from 1 to 9 power of ten The number of places the decimal shifts determines.

Math Meeting Write today’s date. ________________________ 4 years = __________ months 7 weeks = ___________ days How many weeks are in one year? ____________________.

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

Mathsercise-C Rounding Ready? Here we go!. Estimate the value of: 1 Rounding x 7.85 Answer Question 2 Round each number to a sensible figure.

vms Year 8 Mathematics Rounding.

Copyright © 2012 Pearson Education, Inc. Publishing as Prentice Hall. 4.2 Adding and Subtracting Decimals.

January 21, 2010Math 201 OBJECTIVE: Students will be able to estimate a a percent of a quantity AIM: How can we use rounding and mental math to help us.

Expanded Short multiplication How it should look (for 45 X 6)

Significant Figures!.

1.4 Significant Figures in Calculations

Rounding Numbers to the Nearest Hundred

Estimation Estimation is a Skill for Life.

Class Notes: Significant Figures

Strategies Number – addition, subtraction, multiplication and division

Unit 3, Lesson 15 Round and Estimate with Decimals

Multiplying and Dividing Fractions

Significant Figures.

9-2 6th grade math Estimating Percent.

Lesson 7: Estimating Decimal Sums and Differences

Complete the missing numbers using the inverse.

Significant figures RULES TO MEMORIZE!.

Solving Two-Step Equations

Name of Event Name of Event

Unit 3 Review (Calculator)

Unit 4 Lesson 10 Estimate Products Use Rounding to Estimate Products.

Understanding Number I can count forwards up to 1000.

Going round in circles… Going round in circles…

10＋4 10＋6 10＋3 10＋1 10＋9 10＋5 10＋2 10＋8 8+□=10 6+□=10 5+□=10 7+□=10

Is it OK to write down all digits on your calculator?

Calculate 9 x 81 = x 3 3 x 3 x 3 x 3 3 x 3 x 3 x 3 x 3 x 3 x =

Thing / Person:____________________ Dates:_________________

Trigonometric Equations

Division of Large Whole Numbers

Presentation transcript:

[Student Name] [Current Date] Estimating [Student Name] [Current Date]

Why Estimate? Get a quick answer – not exact Check results From your calculator From a report you are reading From a speaker making a claim

Leading Digit Estimates Keep Leading Digit Only 14,567 83,452 28,609 +34,715 10,000 80,000 20,000 30,000 140,000 Quick, but dirty… Keep the leading digit only Maintain place value Calculate

Better Estimates: Round Off Which digits matter? Round off: Up, if the next digit is 5 or more Down, if the next digit is 4 or less 80 81 82 83 84 85 86 87 88 89 80  Round down Round up  90