Click on the link below to watch the animation.

Subtraction: Writing Subtraction Number Sentences

Click on the link below to print and use the Part-Part-Whole Mat to complete the activities with your Learning Coach.

Part-Part-Whole Mat

Read pages 12–13 in

*enVisionMATH 2*with your Learning Coach.

Discuss and complete the

**Guided Practice**problems on page 12, #1–4 with your Learning Coach.

Complete the

**Independent Practice**problems on pages 13–14, #5–10.

Click on the link below to view a PDF sample of the iText pages you need for this lesson.

enVisionMATH 2

Lesson Guide

Click on the link below to print and use the Part-Part-Whole Math to complete the activities with your student.

Part-Part-Whole Mat

**Write 5 – 3 = 2 on a piece of paper.**

Academic Vocabulary

Academic Vocabulary

**This is a**Circle the minus sign.

*subtraction sentence*. What does this symbol mean?**The**

Give your student a paper bag with 8 cubes and a Part-Part-Whole Mat. Have him take 2 cubes out of his bag.

*minus (–)*sign tells you that one of the parts, 3, is being taken away from the whole, 5. When you*subtract*, you find the missing part, or the*difference*.__Pose the Problem__

**How can you use the mat to show how many cubes are still in the bag? What number would you write at the top of the mat?**Allow time for your student to work with his cubes and mat and share his answer.

__Interaction__Open the student text to page 11. Lead your student to recognize that he is working with one part and the whole, and that he needs to find the missing part.

**How many cubes did I place in the bag?**[

*8*]

**I took out 2 cubes. What do you need to find?**[

*Sample responses: the missing part; the number of cubes still in the bag; the other part*]

**8 is the whole.**Have your student write "8" in the whole box at the top of the mat. Explain that he can place the cubes for the part he knows [

*2*] on one side of the mat.

**2 is one of the parts. The missing part is the number of cubes still in the bag.**Guide your student to fill in each part of Item 1. Have your student place the 8 connecting cubes back in the bag. Then guide him to repeat this activity and use the Part-Part-Whole Mat to find the number of cubes remaining in the bag and complete the subtraction sentences for Items 2 and 3.

__Guided Practice__Read pages 12–13 with your student.

Alternatively, you may view the animation with your student and answer any questions he may have.

Have your student discuss and complete the

**Guided Practice**problems on page 12, #1–4 with you.

Tips

Tips

- Remind your student that the number that appears in the box at the top is always the whole in the subtraction sentence.
- Your student may not understand that the whole minus the part equals the missing part. Have him use a Part-Part-Whole Mat, number cards, and cubes.
- Exercise 2

If your student has difficulty understanding that the whole is made up of the part he sees and the missing part, then have him use connecting cubes to model the operation.

Independent Practice

Have your student complete the **Independent Practice ** problems on pages 13–14, #5–10.

Tips

- Encourage your student to use counters to help him model and solve the subtraction sentences.
- Exercise 8
Use a part-part-whole model to represent the problem situation.__Use Part-Part-Whole Models__**How many marbles does Rita have in her box to begin with?**[*12*]**How many marbles does she take out of the box?**[*7*]**What can you do to find out how many marbles are left in the box?**[*Subtract*] - Exercise 9
Encourage your student to think about what he needs to find in order to answer the question.__Test-Taking Tip: Understand the Question__**You need to find out how many children are still playing the game after 3 have gone home.**