Time to sprint!

1. Lesson 9: I can add decimals using place value strategies and relate those strategies to a written method. 5th Grade Module 1 – Lesson 9

2. Time to sprint! Your teacher will give you the sprint. 5th Grade Module 1 – Lesson 9

3. Get Your White Boards Ready! Say this number aloud: 6.358 Record how many tenths are in 6.358 Write the number in the blank that separates the tenths… 6.358 = 63 tenths _______ thousandths Write the number in the blank that separates the hundredths… 6.358 = 635 hundredths _________thousandths 58 8 5th Grade Module 1 – Lesson 9

4. Try another problem (record on your white board): Write the number in the blank that separates the tenths… 7.354 = ______ tenths _______ thousandths Write the number in the blank that separates the hundredths… 7.354 = ______ hundredths _________thousandths 73 54 735 4 5th Grade Module 1 – Lesson 9

5. Let’s review RoundingRecord on your white board… • Say 2.475 to your partner • Round the number to the nearest tenth • Round to the nearest hundredth • Say 2.987 to your partner • Round the number to the nearest hundredth • Round to the nearest whole number 5th Grade Module 1 – Lesson 9

6. Tell your partner the decimalthat is __ more than the given value. *Click mouse to reveal solutions 5th Grade Module 1 – Lesson 9

7. Write the increased value on your white board. *Click mouse to reveal solutions 5th Grade Module 1 – Lesson 9

8. Application Problem Ten baseballs weigh 1,417.4 grams. About how much does one 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? Why? One baseball = 141.74 grams 141.7 grams 142 grams You would tell someone 142 grams. Let’s discuss why! 5th Grade Module 1 – Lesson 9

9. Concept Development Get your place value disks and place value charts ready!! Problem #1: 2 tenths + 6 tenths Solve 2 tenths plus 6 tenths using disks on your place value chart. Say the equation in words to your partner How is this addition problem the same as a whole number addition problem? How did you find the sum? Turn and share with your partner. Now watch me as I model how I solved this problem. 0 8 0 0 5th Grade Module 1 – Lesson 9

10. Try some more problems!Work with your partner. Use your place value mat and disks. Record your work on your whiteboard. Problem #2: 2 ones 3 thousandths + 6 ones 1 thousandth • make the numbers on your place value chart 5th Grade Module 1 – Lesson 9

11. 2 ones 3 thousandths + 6 ones 1 thousandth 8 0 0 4 5th Grade Module 1 – Lesson 9

12. Let’s try another problem!Work with your partner. Use your place value mat and disks. Record your work on your whiteboard. Problem #3: 2 tenths 5 thousandths + 6 hundredths • make the numbers on your place value chart 5th Grade Module 1 – Lesson 9

13. 2 tenths 5 thousandths + 6 hundredths 2 0 6 5 5th Grade Module 1 – Lesson 9

14. Let’s record our last problem vertically. 1st– write 0.205 and the plus sign underneath it on your board.2nd – What do I need to think about when I write my second addend? Tell your partner. *click to reveal 2 tenths 5 thousandths + 6 hundredths 0.205 + 0.060 0.265 I hope you noticed that like units should be aligned with like units. Your answer should mirror the placement of the disks on the chart. 2 0 6 5 5th Grade Module 1 – Lesson 9

15. Let’s do another one together! Problem #4: Use your place value chart and disks to show the addends of this problem. 1.8 + 13 tenths Let’s share & record the different ways we represented these addends. Which way of composing these addends requires the least amount of drawing? Why? Using ones and tenths because drawing 1 one disk is faster than drawing 10 tenths Will the choice of units in your drawing affect your answer (sum)? No! Either drawing is OK. It will still give the same answer. 5th Grade Module 1 – Lesson 9

16. Add. Share your thinking with your partner. 1.8 + 13 tenths = 18 tenths + 13 tenths 31 tenths 1.8 + 1.3 3.1 5th Grade Module 1 – Lesson 9

17. Let’s visualize our class discussion. Also, remember to record the vertical representation (standard algorithm) next to the chart. 1.8 + 13 tenths = ______ Standard Algorithm: 1.8 + 1.3 3.1 1 3 5th Grade Module 1 – Lesson 9

18. Work with your partner and solve the next two problems on your place value chart and record your thinking vertically. Problem #5: • 1 hundred 8 hundredths + 2 ones 4 hundredths Problem #6: • 148 thousandths + 7 ones 13 thousandths Think…which is the more efficient way to draw (compose) 148 thousandths. 5th Grade Module 1 – Lesson 9

19. Solve these problems on your whiteboard. For each problem…1. Create a place value chart and record your written work. 2. Also, write the standard algorithm. Problem #7: 0.74 + 0.59 Problem #8: 7.048 + 5.196 Problem #9: 7.44 + 0.774 5th Grade Module 1 – Lesson 9

20. Get Ready to Complete theProblem Set on Your Own! You may use your place value chart if you need to. You will have 10 minutes to work. Try your Best! **Early Finishers – Try to generate addition problems which have 2 decimal place values, but add up to specific sums, like 1 or 2 (e.g., 0.74 + 0.26). 5th Grade Module 1 – Lesson 9

21. Exit Ticket Time! 5th Grade Module 1 – Lesson 9