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Topic D a dding and subtracting decimals. STANDARD - 5.NBT.2, 5.NBT.3, 5.NBT.7. Grade 5 Module 1 Lesson 10. Objective: S ubtract decimals using place value strategies and relate those strategies to a written method. MATERIALS NEEDED FOR THIS LESSON. Student. Student Pages.
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Topic D adding and subtracting decimals STANDARD - 5.NBT.2, 5.NBT.3, 5.NBT.7
Grade 5 Module 1 Lesson 10 Objective: Subtract decimals using place value strategies and relate those strategies to a written method.
MATERIALS NEEDED FOR THIS LESSON Student Student Pages Place Value Chart Personal White Boards Problem Set Exit Ticket Homework Teacher Teacher Pages
Take Out the Unit 3 minutes 5.NBT.1 76.358 = _____ Say the number 76.358 = 7 tens _____ thousandths 76.358 = 763 tenths _____ thousandths 76.358 = _____ hundredths 8 thousandths
Add Decimals 3 minutes 5.NBT.7 3 tenths + 2 tenths = _____ 5 hundredths + 4 hundredths = 35 hundredths + 4 thousandths =
One Unit Less 4 minutes 5.NBT.7 What is 1 less than 5 tenths? 5 hundredths? 5 thousandths?
What is 1 less than 7 hundredths? 9 tenths?
Write the decimal that is one less thousandths 0.029 Write the decimal that is one tenth less 0.61
Write the decimal that is 1 thousandth less than 0.061? Write the decimal that is 1 hundredth less than 0.549?
Application Problem (5 minutes) At the 2012 London Olympics, Michael Phelps won the gold medal in men's 100 meter butterfly. He swam the first 50 meters in 26.96 seconds. the second 50 meters took him 25.39 seconds. What was his total time?
Problem 1 subtracting decimals 5 tenths - 3 tenths ones tenths thousandths hundredths
7 ones 5 thousandths - 2 ones 3 thousandths ones tenths thousandths hundredths
9 hundreds 5 hundredths - 3 hundredths hundreds ones tens tenths thousandths hundredths
Problem 2 subtracting decimals 85 tenths - 6.4 ones tenths thousandths hundredths
Problem 3 subtracting decimals 9.2 - 6 ones 4 tenths ones tenths thousandths hundredths
0.831 - 0.292 ones tenths thousandths hundredths
4.003 - 1.29 ones tenths thousandths hundredths
6 - 4.08 ones tenths thousandths hundredths
Problem Set (10 minutes) Do Your Personal Best (Complete independently!)
Student Debrief (10 minutes) How could you change Mrs. Fan's question in #4 so that Michael's answer is correct? How is subtracting decimals fractions the same as subtracting whole numbers? How is it different? Look at #2 a, b, and c. What process did you use to find the difference in each of these problems? Did you have to use the standard algorithm to solve #3? Look at b and c. Which one was more challenging? In #3f, how did you think about finding the difference between 59 hundredths from 2 ones 4 tenths? Explain your approach.
EXIT TICKET (3 minutes) Complete the exit ticket and turn in...