1. Topic D adding and subtracting decimals STANDARD - 5.NBT.2, 5.NBT.3, 5.NBT.7

2. Objective: S ubtract decimals using place value strategies and relate those strategies to a written method. Grade 5 Module 1 Lesson 10

3. MATERIALS NEEDED FOR THIS LESSON Place Value Chart Personal White Boards Teacher Student Teacher Pages Student Pages P roblem Set Exit Ticket Homework

4. Fluency Practice (10 minutes)

5. Take Out the Unit 5.NBT.1 3 minutes 76.358 = _____ Say the number 76.358 = 7 tens _____ thousandths 76.358 = 763 tenths _____ thousandths 76.358 = _____ hundredths 8 thousandths

6. Add Decimals 5.NBT.7 3 minutes 3 tenths + 2 tenths = _____ 5 hundredths + 4 hundredths = 35 hundredths + 4 thousandths =

7. One Unit Less 5.NBT.7 4 minutes What is 1 less than 5 tenths? 5 hundredths? 5 thousandths?

8. What is 1 less than 7 hundredths? 9 tenths?

9. Write the decimal that is one less thousandths 0.029 Write the decimal that is one tenth less 0.61

10. Write the decimal that is 1 thousandth less than 0.061? Write the decimal that is 1 hundredth less than 0.549?

11. 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?

12. Concept Development (35 minutes)

13. Problem 1 subtracting decimals 5 tenths - 3 tenths ones tenths hundredths thousandths

14. 7 ones 5 thousandths - 2 ones 3 thousandths ones tenths hundredths thousandths

15. 9 hundreds 5 hundredths - 3 hundredths ones tenths hundredths thousandths tens hundreds

16. Problem 2 subtracting decimals 85 tenths - 6.4 ones tenths hundredths thousandths

17. Problem 3 subtracting decimals 9.2 - 6 ones 4 tenths ones tenths hundredths thousandths

18. 0.831 - 0.292 ones tenths hundredths thousandths

19. 4.003 - 1.29 ones tenths hundredths thousandths

20. 6 - 4.08 ones tenths hundredths thousandths

21. Problem Set (10 minutes) Do Your Personal Best (Complete independently!)

22. Student Debrief (10 minutes) In #3f, how did you think about finding the difference between 59 hundredths from 2 ones 4 tenths? Explain your approach. Did you have to use the standard algorithm to solve #3? Look at b and c. Which one was more challenging? Look at #2 a, b, and c. What process did you use to find the difference in each of these problems? How is subtracting decimals fractions the same as subtracting whole numbers? How is it different? How could you change Mrs. Fan's question in #4 so that Michael's answer is correct?

23. EXIT TICKET (3 minutes) Complete the exit ticket and turn in...

24. HOMEWORK