Presentation on theme: "NYS Math Module 1 Lesson 9 Objective: Add decimals using place value strategies and relate those strategies to a written method. 5.NBT.4 Round to different."— Presentation transcript:
1NYS Math Module 1 Lesson 9Objective: Add decimals using place value strategies and relate those strategies to a written method.5.NBT.4 Round to different place values5.NBT.1 Decompose the unit5.NBT.7 Adding decimals
9Oral FluencyI’m going to show you a decimal, you need to say the decimal that is one tenth more.0.50.70.9
10Now, we are going to count by hundredths Now, we are going to count by hundredths. Say the decimal that is one hundredth more than the given value.0.050.070.09
11Say the decimal that is two tenths more than the given value. 0.30.70.11What is 1 tenth more than 35 hundredths?Write down 35 hundredths, then add 1 tenth0.45
120.351 0.495 What is 1 thousandth more than 35 hundredths? What is 1 hundredth more than 485 thousandths?Remember to write the number first.0.495
13Share your answer with your partner. Word ProblemTen baseballs weigh 1,417.4 grams. About how much does 1 baseball weigh? Round your answer to the nearest tenth of a gram. Round your answer to the nearest gram. If someone asked you, “About how much does a baseball weigh?” which answer would you give them and why?Share your answer with your partner.
15How is this problem the same as a whole number addition problem? Adding DecimalsLet’s add 2 tenths plus 6 tenths using our place value charts.8 tenthsWrite the addition sentence on your board.2 tenths + 6 tenths = 8 tenthsHow is this problem the same as a whole number addition problem?Turn to your partner and share.
16Work with your partner to solve the next two problems on your place value chart. 2 ones 3 thousandths + 6 ones 1 thousandth= 8.0042 tenths 3 thousandths + 6 hundredths0.2030.0600.263+Let’s write it vertically!
17Let’s look at the following problem: tenthsHow would you write 13 tenths?Write it on your white board.13 tenths = 1.3Draw a picture to represent 13 tenths. You may use your place value chart.Share with your partnerSolve: tenths3.1
18Let’s write it vertically! Another way to add and subtract decimals.Tip #1 - ALWAYS line up the decimal! This means the decimals are one on top of another.Tip #2 – Add ZEROS in all the empty spaces.Let’s give it a try.0.740.591.33+Let’s write it vertically!
20Thank you for downloading this presentation. Backgrounds, clip art, and font by:.Laura StricklandClip art from Colleen Alaniz- Totally Terrific in TexasThe following pages are from NYS Math Modules. I minimized the images to reduce the paper waste and thought they may be helpful to others as well. For the entire module visit: