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Class today we will learn how to add decimals using place value strategies, and relate those strategies to a written method. Please take out your math journal, lesson 9, and Netbook.

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5.NBT.2 Explain patterns in the number of zeros of the product when multiplying a number by powers of 10, and explain patterns in the placement of the decimal point when a decimal is multiplied or divided by a power of 10. Use whole-number exponents to denote powers of 10.

5.NBT.3 Read, write, and compare decimals to thousandths.

a. Read and write decimals to thousandths using base-ten numerals, number
names, and expanded form, e.g., 347.392 = 3 × 100 + 4 × 10 + 7 × 1 + 3 × (1/10) +
9 × (1/100) + 2 × (1/1000).
b. Compare two decimals to thousandths based on meanings of the digits in each
place, using >, =, and < symbols to record the results of comparisons.

5.NBT.7 Add, subtract, multiply, and divide decimals to hundredths, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used.

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The vocabulary that we will learn today will be

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The vocabulary that we will learn today will be

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Solve: to find or figure out an answer to.

- Example (s):

1. He solved his bully problem by going home a different way.

2. She solved all of the math problems.

3. The detectives quickly solved the crime.

Sum: the number or amount that comes from adding two or more numbers.
- Example (s):
1. The sum of ten and ten is twenty.

Standard Algorithm: A step-by-step solution. Each step has clear instructions. Like a recipe.
- Example (s):
one algorithm for adding two digit numbers is:
1. add the tens
2. add the units
3. add the numbers from steps 1 and 2

So to add 15 and 32
1. add 10 and 30 to get 40
1. add 5 and 2 to get 7
3. add 40 and 7 to get 47

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You will build fluency of rounding to the nearest whole number.
Get Started you have 5 minutes.
Get ready, get set, THINK!!!

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The vertical written method mirrors the placement of disks on the chart. Like units should be aligned with like units. Avoid procedural language like line up the decimals. Students should justify
alignment of digits based on place value units.

Problem 1: 2 tenths + 6 tenths
Turn and share with your partner and say the sentence using unit form. How is this addition problem the same as a whole-
number addition problem? Then, solve 2 tenths plus 6 tenths using disks on your place value chart.

Work with your partner, and solve the next two problems with
place value disks on your place value chart.
Problem 2: 2 ones 3 thousandths + 6 ones 1 thousandth
Problem 3: 2 tenths 5 thousandths + 6 hundredths

Then, record our last problem vertically. Discuss, with your partner what you need to think about when you write your second addend?

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We will work on each of the problem`s in your activity handout. Take notes in your math journals as we solve each problem. In your math journal write the sum of each problem using standard algorithm. If you have any questions while I am doing each problem raise your hand and I will come to you.

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Independently complete Lesson 9 exit ticket. You have 10 minutes to complete it. When you are finished turn it in to the math basket and work on your multiplication fluency while we wait for the others to finish.

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Take out Lesson 9 Homework from your binder and put it in your homework folder. It is due tomorrow before you leave to PE.

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Instructional Video
Students take out your Netbooks and watch the following Youtube video:
In the search box put eureka math 5th grade model lesson 9

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Grab 1 copy of this newsletter and give it to your parent/guardian so that they can learn the math strategies that you learned today so, that they are able to help you with your homework.

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Standard algorithm is a step-by-step method for solving basic multi-digit math problems and mental computation refers to calculating mentally. A present study where they evaluated children of all achievement levels discovered that these children used the standard algorithm more frequently and efficiently than mental computation.

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Engage NY, (2016 Jan. 26) Grade 5 Mathematics. Retrieved from https://www.engageny.org/resource/grade-5-mathematics-module-1-topic-d-lesson-9
Engage NY, (2014 May 16) Parent and Family Resources. Retrieved from https://www.engageny.org/parent-and-family-resources
Habecker, D. (2015 Sep. 09). Eureka Math Grade 5 Module 1 Lesson 9. [Video File] Retrieved from https://www.youtube.com/watch?v=YP6GFofsg08
Torbeyns, J., & Verschaffel, L. (2016). Mental computation or standard algorithm? children's strategy choices on multi-digit subtractions. European Journal of Psychology of Education, 31(2), 99-116. doi:http://dx.doi.org.cochise.idm.oclc.org/10.1007/s10212-015-0255-8