G1 U9 L2 TE
Applied MP
MPs * Embedded MP
Procedural Lesson Grade 1 · Unit 9 · Lesson 2
1
2
3
*
*
4
5
6
7
*
*
MC: 1.OA.5 Student Journal Pages
5-10
Today I will mentally count back to find the difference.
Vocabulary Number line:
Teacher Resources Considerations: This lesson models how to count back by 1 and 2, but you can teach counting back other numbers.
When you subtract, you move to the left on the number line.
To further assist students struggling with this concept, consider using a number line. The goal is to have students mentally be able to count back.
Steps: Count back: 10, 9, 8, 7, 6, 5, 4, 3, 2, 1 Difference: 9-5=4
1. Put the greater number of the equation in your head. 2. Count back the amount of the second number in the equation. 3. Find the difference.
Application of MPs: MP2: What steps help you solve your problems? MP4: How do you know your answers are correct? MP8: Can you use any shortcuts to solve the problems?
Copyright © Swun Math
Grade 1 Unit 9 Lesson 2 P TE
8
*
Answer Key: I/M
SGP
FCU
SP
CH
HW
1. 7
1. 4
1. 5
1. 9
1. 22
1. 8
2. 10
2. 6
2. 10
2. 2
2. 34
2. 9
Copyright © Swun Math
3. 8
3. 9
4. 6
4. 6
5. 9
5. No , 7
6. No, 5
6. 26
Grade 1 Unit 9 Lesson 2 P TE
/ *MP1: Make sense of the problem and persevere in solving it! *MP8: Find a strategy to help solve the problem. Directions: Count back to find the difference.
1.
8—1=
2.
12 — 2 =
MP2: What steps helped you solve your problems? MP4: How do you know your answers are correct? MP8: What strategies did you use to help solve your problems?
Copyright © Swun Math
Grade 1 Unit 9 Lesson 2 P TE
/ Directions: Count back to find the difference.
1.
5—1=
2.
8—2=
MP2: What steps helped you solve your problems? MP4: How do you know your answers are correct? MP8: What strategies did you use to help solve your problems?
Copyright © Swun Math
Grade 1 Unit 9 Lesson 2 P TE
Directions: Count back to find the difference.
1.
7—2=
2.
11 — 1 =
Copyright © Swun Math
Grade 1 Unit 9 Lesson 2 P TE
Name: ____________________________ Directions: Count back to find the difference.
1.
Date: ______________________________
10 — 1 =
2.
4—2= 3.
10 — 2 =
4.
8—2=
5.
11 — 2 =
6. Does 6 — 1= 7? If not, find the correct difference.
6—1=7 Yes
Copyright © Swun Math
No
6—1= Grade 1 Unit 9 Lesson 2 P TE
Directions: Count back to find the difference.
1.
23 — 1 =
2.
36 — 2 =
*MP3: Do you agree/disagree with what
said?
*MP6: How do you know your answers are correct/reasonable?
Recap today’s lesson with one or more of the following MP questions: MP2: What steps helped you solve your problems? MP4: How did you know your answers were correct? MP8: What strategies did you use to help solve your problems?
Copyright © Swun Math
Grade 1 Unit 9 Lesson 2 P TE
Name: ____________________________ Directions: Count back to find the difference.
1.
Date: ______________________________
9—1=
2.
10 — 1 = 3.
11 — 2 =
4.
7—1=
5. Does 9 — 2 = 11? If not, find the correct difference.
9 — 2 = 11 Yes 6.
Copyright © Swun Math
No
9—2=
28 — 2 = Grade 1 Unit 9 Lesson 2 P TE
MPs * Embedded MP
Procedural Lesson Grade 1 · Unit 9 · Lesson 2
1
2
3
*
*
4
5
6
7
*
*
MC: 1.OA.5 Student Journal Pages
5-10
Today I will mentally count back to find the difference.
Vocabulary Number line:
Teacher Resources Considerations: This lesson models how to count back by 1 and 2, but you can teach counting back other numbers.
When you subtract, you move to the left on the number line.
To further assist students struggling with this concept, consider using a number line. The goal is to have students mentally be able to count back.
Steps: Count back: 10, 9, 8, 7, 6, 5, 4, 3, 2, 1 Difference: 9-5=4
1. Put the greater number of the equation in your head. 2. Count back the amount of the second number in the equation. 3. Find the difference.
Application of MPs: MP2: What steps help you solve your problems? MP4: How do you know your answers are correct? MP8: Can you use any shortcuts to solve the problems?
Copyright © Swun Math
Grade 1 Unit 9 Lesson 2 P TE
8
*
Answer Key: I/M
SGP
FCU
SP
CH
HW
1. 7
1. 4
1. 5
1. 9
1. 22
1. 8
2. 10
2. 6
2. 10
2. 2
2. 34
2. 9
Copyright © Swun Math
3. 8
3. 9
4. 6
4. 6
5. 9
5. No , 7
6. No, 5
6. 26
Grade 1 Unit 9 Lesson 2 P TE
/ *MP1: Make sense of the problem and persevere in solving it! *MP8: Find a strategy to help solve the problem. Directions: Count back to find the difference.
1.
8—1=
2.
12 — 2 =
MP2: What steps helped you solve your problems? MP4: How do you know your answers are correct? MP8: What strategies did you use to help solve your problems?
Copyright © Swun Math
Grade 1 Unit 9 Lesson 2 P TE
/ Directions: Count back to find the difference.
1.
5—1=
2.
8—2=
MP2: What steps helped you solve your problems? MP4: How do you know your answers are correct? MP8: What strategies did you use to help solve your problems?
Copyright © Swun Math
Grade 1 Unit 9 Lesson 2 P TE
Directions: Count back to find the difference.
1.
7—2=
2.
11 — 1 =
Copyright © Swun Math
Grade 1 Unit 9 Lesson 2 P TE
Name: ____________________________ Directions: Count back to find the difference.
1.
Date: ______________________________
10 — 1 =
2.
4—2= 3.
10 — 2 =
4.
8—2=
5.
11 — 2 =
6. Does 6 — 1= 7? If not, find the correct difference.
6—1=7 Yes
Copyright © Swun Math
No
6—1= Grade 1 Unit 9 Lesson 2 P TE
Directions: Count back to find the difference.
1.
23 — 1 =
2.
36 — 2 =
*MP3: Do you agree/disagree with what
said?
*MP6: How do you know your answers are correct/reasonable?
Recap today’s lesson with one or more of the following MP questions: MP2: What steps helped you solve your problems? MP4: How did you know your answers were correct? MP8: What strategies did you use to help solve your problems?
Copyright © Swun Math
Grade 1 Unit 9 Lesson 2 P TE
Name: ____________________________ Directions: Count back to find the difference.
1.
Date: ______________________________
9—1=
2.
10 — 1 = 3.
11 — 2 =
4.
7—1=
5. Does 9 — 2 = 11? If not, find the correct difference.
9 — 2 = 11 Yes 6.
Copyright © Swun Math
No
9—2=
28 — 2 = Grade 1 Unit 9 Lesson 2 P TE
