Adding and Subtracting Decimals
Decimals - numbers that are smaller than one whole.
When do you see decimals in the real world?
Decimal Models: Tenths and Hundreths
Decimal Models
1 + .25 = 1.25
Decimal Models: Hundredths and Thousandths
Place Value
Place Values change in the same ways on BOTH sides of the decimal point.
Remember: each place have a value of 10 times that of the place to its right
Move decimal point to the RIGHT
Move decimal point to the LEFT
Represent as a Decimal or a Fraction
Two ways to write one tenth are 0.1 and 1 / 10
Two ways to write one hundredth are 0.01 and
How to write a decimal 3 ways
Standard Form: 2.35
Word Form: two and thirty-five hundredths
Expanded Form: 2 x 1 + 3 x (1/10) + 5 x (1/100)
OR 2 + .3 + .05
Standard Form: 1.72
Word Form: _________________________________________________________
Expanded Form: 1 x 1 + 7 x (1/10) + 2 x (1/100)
Standard Form: ______________________________________________
Word Form: four and sixty one hundredths
Expanded Form: 4 x 1 + 6 x (1/10) + 1 x (1/100)
Standard Form: 3.614
Word Form: Three and six hundred fourteen thousandths
Expanded Form: _______________________________________________________________________
Find the value of the underlined digit
Place value: The value of the place of a digit in a number.
8 54.327 - The value of the digit 8 is 8 hundreds, or 800.
8 5 4.327 - The value of the digit 5 is 5 tens, or 50.
85 4 .327 - The value of the digit 4 is 4 ones, or 4.
854. 3 27 - The value of the digit 3 is 3 tenths, or 0.3.
854.3 2 7 - The value of the digit 2 is 2 hundredth, or 0.02.
854.32 7 - The value of the digit 7 is 7 thousandths, or 0.007.
Find the value of the underlined digit.
0.4 or four tenths
0.03 or three hundredths
0.006 or six thousandths
0.0005 or five ten thousandths
Compare Decimals
- Line up decimal points
- Fill in any place values with zero
- Begin at left and compare the digits until they are different
- Decide which digit is smaller or larger
- Use the correct symbol to show the relationship between the two numbers
0.264 _<_ 0.4 2 < 4
0.45____0.1
0.8____ 0.207
1.234___1.23
3.45 ____1.45
0.09____0.090
0.45_ > ___0.1
0.8_ > ___ 0.207
1.234_ > __1.23
3.45 __ > __1.45
0.09__ = __0.090
Ordering Decimals
Rounding Decimals
Rounding Decimals Video
If the number to the right is 5 or above, give it a shove.
If the number to the right is 4 or below, then let it go.
Round each number to the nearest tenth.
Round each number to the nearest hundredth.
Round each number to the nearest thousandth.
Adding Decimals
1. Line up decimal point to help you align the place value positions. Decimal point should be between the ones and tenths place.
** If needed, add zeros to make equivalent decimals
2. Add as you normally would. Bring down decimal point in the sum.
- 0.59 + 1.15
1.4 + 0.22 0.81 + 0.43
Subtracting Decimals
1. Line up decimal points to align place-value positions. Subtract the place value to the right.
2. Move the next place value to the left and continue subtracting. Regroup if needed.
3. Bring down the decimal point in the difference.
4. Check with quick addition.
- 0.61 - 1.08
0.84 - 0.17 1.39 - 1.14
Add or Subtract Decimals Video
Add or Subtract
1. 8.2 + 2.28 + 2.18
2. 8.22 - 4.39
3. $54.78 + $43.62
4. 6.3 + 2.98 + 7.7
5. $18 - $3.55
Change words to decimals than add or subtract
1.) seven and twenty- five hundredths added to nine and four tenths.
2.) twelve and eight hundredths added to four and thirty-five hundredths.
3.) one and eighty-two hundredths added to fifteen and eight tenths.
4.) three and seventy-two hundredths subtracted from five and eighty-one hundredths.
5.) one and six hundredths subtracted from eight and thirty-two hundredths.
6.) five and twenty-five thousandth subtracted from nine and fifteen thousandths.
Estimating before + or -
You can use rounding to help you estimate sums and differences.
Use rounding to estimate 1.24 + 0.82 + 3.4
Round to the nearest whole number. Then add.
You can use benchmarks to estimate.
- 0.30 - 0.25
0.78 is between 0.75 and 1. It is closer to 0.75
0.30 is between 0.25 and 0.50. It is closer to 0.25
Adding and Subtracting Decimals
Jul 28, 2014
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Adding and Subtracting Decimals. Lesson 1-5. The Basic Steps:. Line up the numbers by the decimal point. Fill in missing places with zeroes. Add or subtract. Addition Properties. Commutative Property of Addition: Numbers can be added in any order. Example: 5+3=3+5.
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Adding and Subtracting Decimals Lesson 1-5
The Basic Steps: • Line up the numbers by the decimal point. • Fill in missing places with zeroes. • Add or subtract.
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) 28.9 0 + 13.31 42.21 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 0 1 4 9 9 10 .000 15 - 9.372 5 . 6 2 8
Classwork Use this site to play MATHFROG- ADDING AND SUBTRACTING FRACTIONS http://cemc2.math.uwaterloo.ca/mathfrog/english/kidz/addsubdec.shtml Homework Time! P. 27, 1-49 odd
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Adding and Subtracting Decimals Solve problems involving addition and subtraction of decimals.
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SOLVING WORD PROBLEMS INVOLVING ADDITION AND SUBTRACTION OF DECIMALS & MIXED DECIMALS
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Mathematics 6 Quarter 1 – Module 7: Multiplying Decimals and Mixed Decimals
This module was designed and written with you in mind. It is here to help you master the skills in multiplying decimals. The scope of this module allows you to use it in many different learning situations. The language used recognizes your diverse vocabulary level. The lessons are arranged to follow the standard sequence of your course. But the order in which you read them can be changed to match with the textbook you are now using.
The module is divided into three lessons, namely:
- Lesson 1 – Multiplying Decimals with Factors Up to 2 Decimal Places
- Lesson 2 – Multiplying Mixed Decimals with Factors Up to 2 Decimal Places
- Lesson 3 – Multiplying Decimals and Mixed Decimals with Factors Up to 2 Decimal Places
After going through this module, you are expected to:
1. multiply decimals with factors up to 2 decimal places; (M6NS-Ie-111.3)
2. multiply mixed decimals with factors up to 2 decimal places; (M6NS-Ie-111.3)
3. multiply decimals and mixed decimals with factors up to 2 decimal places; (M6NS-Ie-111.3)
4. solve routine and non-routine problems involving multiplication of decimals and mixed decimals including money using appropriate problem-solving strategies; (M6NS-Ie-113.2) and
5. solve multi-step problems involving multiplication and addition or subtraction of decimals, mixed decimals and whole numbers including money using appropriate problem-solving strategies and tools. (M6NS-If-113.3)
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Decimals word problems
Adding and subtracting decimals.
These grade 4 math worksheets have word problems involving the addition and subtraction of one-digit decimals. Some questions may i) have 3 terms, ii) involve comparisons or iii) require conversions of fractions with a denominator of 10 or 100.
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Add and subtract word problems.
Subject: Mathematics
Age range: 7-11
Resource type: Worksheet/Activity
Last updated
26 December 2020
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1. Line up decimal points to align place-value positions. Subtract the place value to the right. ** If needed, add zeros to make equivalent decimals. 2. Move the next place value to the left and continue subtracting. Regroup if needed. 3. Bring down the decimal point in the difference. 4. Check with quick addition.
Adding and Subtracting Decimals. 6 NS 3 Solve problems involving addition and subtraction of decimals. To add 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. Example 1. 0.64 + 0.39. 384 views • 7 slides
Adding and Subtracting Decimals NS 1.0 Solve problems involving addition and subtraction of decimals. 2. To add 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.
Browse adding and subtracting decimals power point resources on Teachers Pay Teachers, a marketplace trusted by millions of teachers for original educational resources.
Using this PowerPoint, kids will be able to add and subtract decimals using the formal column method for difficult methods, and mental maths for simplier equations. At the end of this PowerPoint, you'll also discover useful practice questions for your pupils to explore. If you would like even more questions to explore on adding and subtracting ...
Download ppt "Adding and Subtracting Decimals" Similar presentations ... Adding and Subtracting Decimals NS 1.0 Solve problems involving addition and subtraction of decimals. Decimals. 63.45 - Lesson 4-6 Example Example 3 Find - Write the numbers vertically. Line up the decimal points. Add a zero so that the.
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(Math 6 Wk 5 L9) - Problems Involving Addition and or Subtraction of Decimals PPT - Free download as Powerpoint Presentation (.ppt / .pptx), PDF File (.pdf), Text File (.txt) or view presentation slides online. m
Key learning points. In this lesson, we will solve addition and subtraction problems with decimals and generate our own word problems to suit equations. We will develop our understanding of decimal problem-solving through bar models and a variety of real life contexts. This content is made available by Oak National Academy Limited and its ...
SOLVING WORD PROBLEMS INVOLVING ADDITION AND SUBTRACTION OF DECIMALS & MIXED DECIMALS.pptx - Free download as Powerpoint Presentation (.ppt / .pptx), PDF File (.pdf), Text File (.txt) or view presentation slides online.
Engage 5th-grade students with addition, subtraction, multiplication, and division using decimals and placeholders with this interactive PowerPoint. Students will understand how to use decimals points and placeholders when solving a variety of problems. Students will be able to observe the teacher solve, actively engage with partners to solve problems, as well as work independently to learn ...
1. Lingley Math 7 Name: _____ Class: ____ Date: _____ Read each of the questions below carefully. Determine if you need to add or subtract - circle the key word(s) that tell(s) you. Use front-end estimation to estimate if your answer is reasonable. 4+ - Surpasses Learning Goals 4 - Excelling with Learning Goals 3+ - Consistent Proficiency 3 - Meeting Learning Goals 2 - Approaching Learning ...
Completing Forms, Try these 6, page 84 Decimals. 9. Completing Forms, Practice Moza buys 2 apples, 2 sandwiches , a hot dog and 2 coffees Decimals. 10. Work on Exercise 2.4 Page 85-87 1, 2 and 3 For Homework Decimals. 11. Write these numbers in words. Decimals. Decimals Problem Solving - Download as a PDF or view online for free.
It also indicates that the design and implementation of some activities to teach the word problems in wh ich the analysis to identify patterns is a necessary strategy. The study results revealed that using "identifying a pattern" problems is a useful tool to promote problem-solving competency for elementary school students in Vietnam.
1. add decimal numbers through thousandths with and without regrouping; 2. subtract decimal numbers through thousandths with and without regrouping; and. 3. solve routine or non-routine problems involving addition and subtraction of decimal numbers including money using appropriate problem solving strategies and tools.
pdf, 285.33 KB. This worksheet and problem cards will help students deepen their understanding of addition and subtraction of decimals. Creative Commons "Sharealike". Report this resource to let us know if it violates our terms and conditions. Our customer service team will review your report and will be in touch.
5. solve multi-step problems involving multiplication and addition or subtraction of decimals, mixed decimals and whole numbers including money using appropriate problem-solving strategies and tools. (M6NS-If-113.3) Math-G6-Q1-Mod7-v2. Categories DepEd Resources, Grade 6.
Adding and subtracting decimals. These grade 4 math worksheets have word problems involving the addition and subtraction of one-digit decimals. Some questions may i) have 3 terms, ii) involve comparisons or iii) require conversions of fractions with a denominator of 10 or 100. Worksheet #1 Worksheet #2 Worksheet #3 Worksheet #4.
This document provides examples of multi-step word problems involving addition, subtraction, and multiplication of decimals and money. It includes sample word problems, instructions to read numbers, round decimals, and perform calculations. It discusses solving word problems by identifying relevant facts and operations. Students are asked to relate practical examples using decimals and provide ...
Solving Word Problems Involving Addition and Subtraction of Decimals & Mixed Decimals - Free download as Powerpoint Presentation (.ppt / .pptx), PDF File (.pdf), Text File (.txt) or view presentation slides online.
Make maths fun with this addition and subtraction word problem PowerPoint! Each slide features a different word problem which can be completed in a copybook or on a flip chart. Twinkl Twinkl Ireland Resources English Medium Schools 1st/2nd Class Maths. word problems powerpoint addition and subtraction word problems powerpoint addition and ...
Word problems addition and subtraction - Download as a PDF or view online for free ... Ppt addition of dissimilar fractions (loids) ... 7. solving two step word problems involving addition and subtraction of whole... 7. solving two step word problems involving addition and subtraction of whole... Annie Villamer ...
Add and subtract word problems. Subject: Mathematics. Age range: 7-11. Resource type: Worksheet/Activity. File previews. ppt, 292 KB. A power point to illustrate and demonstrate solving word problems involving addition and subtraction.