Topic D adding and subtracting decimals STANDARD - 5.NBT.2, 5.NBT.3, 5.NBT.7 Grade 5 Module 1 Lesson 9 Objective: Add decimals using place value strategies and relate those strategies to
a written method. MATERIALS NEEDED FOR THIS LESSON Student Student Pages Sprint A & B Problem Set Exit Ticket Homework
Personal White Boards place value disks Teacher Teacher Pages Fluency Practice (14 minutes) Round to the Nearest One
8 minutes 5.NBT.4 A T N I SPR
1 minutes Do as many problems as you can. Do your personal best. Take your mark! Get set! THINK! Round to the Nearest One 5.NBT.4
B T N I SP R 1 minutes Do as many problems as you can. Do your personal best. Take your mark!
Get set! THINK! Decompose the Unit 5.NBT.1 6.358 Say the number How many tenths? _____ tenths _____ hundredths
2 minutes 7.354 Say the number How many tenths? _____ tenths _____ hundredths Round to Different Place Vlaues 5.NBT.4
2 minutes 2.475 Say the number? Round to the nearest tenth Round to the nearest hundredth 2.987 Say the number?
Round to the nearest tenth Round to the nearest hundredth One Unit More 5.NBT.7 Say the decimal that's one tenth more .. 5 tenths 5 hundredths
5 thousandths 2 minutes Say the decimal that's one tenth more .. 8 hundredths 3 tenths 2 thousandths
What is one more thousandth 0.052 What is one more tenth more than 35 hundredths What is 1 thousandth more than 35
hundredths What is one hundredths more than 438 thousandths Application Problem (5 minutes)
Ten baseballs weigh 1,417.4 grams. About how much does 1 baseball weigh? Round your answer to the nearest tenth of a gram. Round to the nearest gram. If someone asked you, "About how much does a baseball weigh?" which anser would you give? Why? Concept Development (31 minutes)
Problem 1 adding decimals 2 tenths + 6 tenths ones tenths hundredths
thousandths Problem 2 adding decimals 2 ones 3 thousandths + 6 ones 1 thousandths ones tenths
hundredths thousandths Problem 3 adding decimals 2 tenths 5 thousandths + 6 hundredths ones
tenths hundredths thousandths Problem 4 adding decimals
1.8 + 3 tenths ones tenths hundredths thousandths Problem 5
adding decimals 1 hundred 8 hundredths + 2 ones 4 hundredths hundreds tens ones tenths
hundredths thousandths Problem 6 adding decimals 148 thousandths + 7 ones 13 thousandths hundreds
tens ones tenths hundredths thousandths
Problem 7 adding decimals 0.74 + 0.59 hundreds tens ones
tenths hundredths thousandths Problem 8 adding decimals
7.048 + 5.196 hundreds tens ones tenths hundredths
thousandths Problem 9 adding decimals 7.44 + 0.774 hundreds tens
ones tenths hundredths thousandths Problem Set
(10 minutes) Do Your Personal Best (Complete independently!) Student Debrief (10 minutes)
How is adding decimal fractions the same as adding whole numbers? How is it different What are some different words you have used through the grades for changing 10 smaller units for 1 of the next larger units or changing 1 unit for 10 of the next smaller units? What do you notice about the addends in letters b,d and f in #1? Explain the thought process in solving these problems.
EXIT TICKET Complete the exit ticket and turn in... (3 minutes) HOMEWORK