- Preferences
Adding and Subtracting Decimals - PowerPoint PPT Presentation
Adding and Subtracting Decimals
Adding and subtracting decimals ns 1.0 solve problems involving addition and subtraction of decimals. to add decimals line up the decimal points and add the columns ... – powerpoint ppt presentation.
- NS 1.0 Solve problems involving addition and subtraction of decimals.
- Line up the decimal points and add the columns from right to left.
- Place a decimal point in the answer directly below the other decimal points.
- Line up the decimal points.
- __________________________
- Add the columns.
- _____________________________
- Subtract the columns from right to left, regrouping if necessary.
- Line up the decimal points
- Regroup the tenths. Subtract the columns.
PowerShow.com is a leading presentation sharing website. It has millions of presentations already uploaded and available with 1,000s more being uploaded by its users every day. Whatever your area of interest, here you’ll be able to find and view presentations you’ll love and possibly download. And, best of all, it is completely free and easy to use.
You might even have a presentation you’d like to share with others. If so, just upload it to PowerShow.com. We’ll convert it to an HTML5 slideshow that includes all the media types you’ve already added: audio, video, music, pictures, animations and transition effects. Then you can share it with your target audience as well as PowerShow.com’s millions of monthly visitors. And, again, it’s all free.
About the Developers
PowerShow.com is brought to you by CrystalGraphics , the award-winning developer and market-leading publisher of rich-media enhancement products for presentations. Our product offerings include millions of PowerPoint templates, diagrams, animated 3D characters and more.
Adding and Subtracting Decimals
The Basic Steps:
- Line up the numbers by the decimal point.
- Fill in missing places with zeroes.
- Add or subtract.
Addition properties
- Get into groups of 3-4
- You will be given an addition property
- Each group will make a little poster of their property which includes the property name, definition, example, and an easy way to remember the property.
- You will have 10 minutes
Addition Properties
Commutative Property of Addition: Numbers can be added in any order.
Example: 5+3=3+5
Associative Property of Addition: Numbers can be grouped in any way.
Example: (7+3) + 5 = 7 + (3+5)
Identity Property of Addition: The sum of any number and zero is that number.
Example: 18 + 0 = 18
Mental Math
- Addition properties can be used to quickly find sums.
- Example: What is 52 + 12.4 + 48?
- We can use an addition property to quickly add this.
- First, change the order: 52 + 48 + 12.4 ________________ property.
- Then, group the first two addends together: �(52 + 48) + 12.4�________________ property
- 100 + 12.4 = 112.4
commutative
associative
Why Estimate?
- Before adding your numbers, use one of the estimating strategies you learned to see what the answer should be close to.
- When you add, you can see if your answer is reasonable .
Example: 28.9 + 13.31
This can estimate to 30 + 13, which is 43. (Compatible numbers)
The answer is close to the estimate.
Subtracting
- The addition properties do not work for subtraction.
- Estimate and subtract to find what the answer is close to.
- Subtract to find the real answer.
Subtracting Across Zeroes
- If you have several zeroes in a row, and you need to borrow, go to the first digit that is not zero, and borrow.
- All middle zeroes become 9’s.
- The final zero becomes 10.
Example: 15 – 9.372
Homework Time
The above image is a royalty free picture provided by http://www.bigfoto.com
1.1-1.2 Worksheet, Quiz Tomorrow
- My presentations
Auth with social network:
Download presentation
We think you have liked this presentation. If you wish to download it, please recommend it to your friends in any social system. Share buttons are a little bit lower. Thank you!
Presentation is loading. Please wait.
Adding and Subtracting Decimal Word Problems
Published by Josephine Shaw Modified over 6 years ago
Similar presentations
Presentation on theme: "Adding and Subtracting Decimal Word Problems"— Presentation transcript:
SOLVING PROBLEMS INVOLVING DISCOUNTS AT SALES AND SALES TAX.
Math-8 NOTES DATE: ______/_______/_______ What : Consumer Applications Why: To calculate the sales tax, discounts, and tips in various real-life situations.
Ounces & Pounds How much is an Ounce (oz)? 1 slice of bread= 1 ounce (oz) Or 5 new pencils = 1 ounce (oz)
EXAMPLE 1 Finding a Sale Price You are shopping for a guitar and find one with an original price of $160. The store is offering a 30% discount on all guitars.
7 th Grade Math Ms. Richardson. Before, we answered all types of percent questions using proportions. However, when you are finding the percent of.
Using a calculator When using a calculator for money you have to add in a number yourself sometimes. This only happens when the answer to a question should.
5-3 Solving systems by Elimination
Discounts, Sales Tax and Tip. What would the sale price be for a pair of pants that cost $48.00 after a 30% discount is given? Step 1: change the % into.
Mixed Review Version 4.0. #1 Find the next three numbers in the sequence: 60, 54, 48, 42, ___, ___, ___ Find the next three numbers in the sequence: 60,
Using Percents to Solve Problems
PROPORTIONAL REASONING
Warm Ups 1)Thirty is 12% of what number? 2)Find 115% of )Find I, if p = $950, r = 9%, and t = 6 months Answers: 1)250 2)161 3)$42.75.
Warm ups: Eric bought a pair of shoes originally priced at $95 for 45% off. He paid $52.25 not including tax. Which equation shows how Eric.
Mathematics 2 Ms. Meek Adding and Subtracting Money Amounts.
COMPARING AND ORDERING RATIONAL/INTEGER RULES REVIEW.
Math 010: Word problems & Exam Review Part I October 16, 2013.
How to add and subtract decimals When adding and subtracting decimals you always need to make shoer that every number is lined up properly and that the.
Using Percent. Warm-up: Get a calculator Find the percent of each number. 1)25% of 200 2)22% of 40 3)63% of 89 4)112% of 24 5)Jenny sold 380 boxes of.
Sales Tax and Discount Lesson 8 – 8. Vocabulary Sales Tax – an additional amount of money charged to a purchase. Discount – the amount by which the regular.
Adding and Subtracting Percents
About project
© 2024 SlidePlayer.com Inc. All rights reserved.