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3rd Grade Math - Lesson 1                   

Lesson 1: Sums to 10

Introduction

 

                          

(Use the picture above or real objects at home to introduce this topic)

Read to student:

1. Today, Maryam's mother gave her 3 cookies after lunch and 2 cookies after dinner. How many cookies in all did Maryam eat today?

(have student answer the question)

Remind student that whenever they hear "in all" this tells them to add (or multiply). OR ask student what words in the word problem indicated that they should add.

2. We can write what we call a number sentence to show this:

3 + 2 = 5

We read this as: three plus two equals five.

The  numbers that we add together, in this case, 3 and 2 are called "Addends" (have student repeat this word).

The answer that we get, in this case, 5, is called the "sum." (have student repeat this).

Practice 1: Identifying Addends and Sums

In the following problems, tell what the addends are:

2 + 4 = 6             3 + 5 = 8

1 + 2 = 3             4 + 1 = 5

6 + 2 = 8             3 + 4 = 7

In the above problems go back and tell what the sum is.

Also have student read the problems.

Practice 2: Practicing Addition

This should be a monitored activity.

Give student sets of objects to add (such as candy or toys). Student should make two piles (e.g. 2 objects in one pile, 3 in the other).

Have student write a number sentence to show what is happening (i.e. how many we get when we add the two piles).

Have student read the number sentence.

Have student identify the addends and sums in each number sentence written.

Do this for 5 -10 different sets. After each number sentence is written, have student reverse the addends (in the number sentence, but also in the objects laid out) to see that it doesn't matter which number is written first.  (i.e. 3 + 2 = 5  is the same as 2 + 3 = 5)

Tip: When student writes number sentences, have him/her vary whether they are written vertically or horizontally.

Independent practice 1:

Student will complete a worksheet of addition problems.

Generate an addition math worksheet from Soft Schools.com: (You can generate in PDF format. Be sure to set the total sum limit to 10.

After student completes the worksheet:

1. Point to 5 - 10 of the problems and ask student what the addends are and what the sum is.

 

After the lesson (prep for teacher before next lesson)

Go to next lesson or not?

Decide whether you want to go on to lesson 2 (sums to 18) or stay on this lesson for more practice.  If student grasps the concept of addition, but hasn't memorized the facts, you can either choose to work on them some more for the next few days (e.g. generate more worksheets), or simply go on to lesson 2 and provide daily addition facts practice.

 

Math Deck (flashcards)

Begin a math flashcard pack to use for daily review. As soon as student has mastered concepts, you can remove cards as the pack gets larger, but remember to review removed cards regularly.

Include the following cards to start:

(Tip: Copy and paste the following text into Word to make the cards)

 

Card 1.1

Front: What are addends?

Back: Addends are numbers added together.

 

Card 1.2

Front: What is a sum?

Back: The answer to an addition problem.

 

Card 1.3

Front: Give student 5 addition problems (oral or written or varied.)

1. Have student identify the addends and sums. 

2. Have student read the problems and answer them.

 

After this session, each math session should begin with a short review period. In this review period:

1. Review the flashcard cards

2. Give math facts drills (but can be given at another point in the day)

For the math facts drills, begin with the addition sums to 5, then to 10, then to 15, then to 20. (See TJ's addition page for drill sheets). Give the problems orally/written daily until mastered.  You can also use

 flashcards.

 

TJ Third Grade Math Lessons

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This page last updated:

Friday, May 09, 2008

 

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