1 Using Subtraction to solve one step word problemsLesson 15 Using Subtraction to solve one step word problems

2 Lesson Objective After this lesson you will be able to:Use the standard subtraction algorithm to solve one step word problems. You will also be using your place value understanding to decompose numbers smaller units to solve one step word problems.

3 Let’s Start with a ProblemWhen the amusement park opened, the number on the counter at the gate read 928,614.  At the end of the day, the counter read 931,682.  How many people went through the gate that day?

4 Problem # 1 When the amusement park opened, the number on the counter at the gate read 928,614.  At the end of the day, the counter read 931,682.  How many people went through the gate that day? What do I need to solve for? What do I know?

5 Problem # 1 When the amusement park opened, the number on the counter at the gate read 928,614.  At the end of the day, the counter read 931,682.  How many people went through the gate that day? What do I need to solve for? What do I know?

6 It’s time to create our handy dandy…Problem # 1 It’s time to create our handy dandy…

7 It’s time to create our handy dandy… NOTEBOOK!Problem # 1 It’s time to create our handy dandy… NOTEBOOK!

8 It’s time to create our handy dandy… NOTEBOOK! Just kidding. : ) Problem # 1 It’s time to create our handy dandy… NOTEBOOK! Just kidding. : ) We need to create a tape diagram.

9 Problem # 1 Where do our numbers 928,614 and 931,682 go?

10 Problem # 1 931,682 928,614 P

11 Problem # 1 Now it’s time to set-up our subtraction problem. 931,682928,614 P Now it’s time to set-up our subtraction problem.

12 Problem # 1 Are we ready to subtract? 931,682 ,614

13 - 928,614 931,682 Problem # 1 Are we ready to subtract?Remember to check if we need to regroup. 931,682 ,614

14 Problem # 1 Let’s go ahead and regroup now. 931,682 ,614

15 Problem # 1 Let’s go ahead and regroup now. Are we ready to subtract? 2 11 7 12 931,682 ,614

16 Problem # 1 Remember to start with the ones and work our way up. 2 11 7 12 931,682 928,614 8

17 Problem # 1 Remember to start with the ones and work our way up. 2 11 7 12 931,682 928,614 68

18 Problem # 1 Remember to start with the ones and work our way up. 2 11 7 12 931,682 928,614 068

19 Problem # 1 Remember to start with the ones and work our way up. 2 11 7 12 931,682 928,614 3,068

20 Problem # 1 Remember to start with the ones and work our way up. 2 11 7 12 931,682 928,614 03,068

21 Problem # 1 Remember to start with the ones and work our way up. 2 11 7 12 931,682 928,614 003,068

22 Problem # 1 So our final answer is 3,068 people. 2 11 7 12 931,682 928,614 3,068

23 Let’s Try One More ProblemLast year, there were 620,073 people in attendance at a local parade.  This year, there were 456,795 people in attendance.   How many more people were in attendance last year?

24 Let’s Try One More ProblemLast year, there were 620,073 people in attendance at a local parade.  This year, there were 456,795 people in attendance.   How many more people were in attendance last year? With a partner create a tape diagram for this problem.

25 Problem # 2 Did your partner and you get…

26 Problem # 2 Did your partner and you get this or something similar?620,073 Last year This year 456,795 A

27 Problem # 2 Now it’s time for you to solve this subtraction problem on your own… 620, ,795

28 Problem # 2 Did you get… 620, ,795

29 Problem # 2 Did you get… 11 9 9 16 5 12 10 10 17 13 620, ,795

30 Problem # 2 Did you get… 11 9 9 16 5 12 10 10 17 13 620, ,795 163,278

31 Great Job! All right now it is your turn!Complete the 3 Problems on page 82