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Third Grade Lessons
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You are here: TJ Home >> Math >> Lessons-3rd Grade >>Lesson 2
3rd Grade Math - Lesson 2
Lesson 2: Sums to 18
Warm Up/Review
(Can be done at a later time in the day as well, just be sure to try to get this in a review is key.)
1. Review the math deck flashcard cards (see lesson 1 for explanation)
2. Give math facts drills (worksheet or orally). Here are some from TJ:
Sums to 5, Sums 6 to 10, Sums 11 to 15
3. Give a few word problems with sums to 10 for student to answer orally. Optional: Have student write the corresponding number sentences.
Introduction
Last Year:
Masajid build this year:
(Use the picture above or real objects at home to introduce this topic)
Read to student:
1. If there were seven masajid in the city of Bayhan last year. This year, 6 more were built, how many masajid are there in all in Bayhan now?
(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. Again, we can write what we call a number sentence to show this:
7 + 6 = 13
We read this as: seven plus six equals thirteen.
The numbers that we add together, in this case, 7 and 6 are called "Addends" (have student repeat this word).
The answer that we get, in this case, 13, is called the "sum." (have student repeat this).
Practice 1: Identifying Addends and Sums
In the following problems, tell what the addends are:
7 + 7 = 14 8 + 9 = 17
9 + 4 = 13 11 + 5 = 16
12 + 6 = 18 10 + 9 = 10
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.
Pick one option, or do both.
Option 1: Give student sets of objects (18 available) to add (such as candy or toys). Student should make two piles (e.g. 8 objects in one pile, 6 in the other). Tell student he must use ten or more objects to form the sets.
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. 7 + 6 = 13 is the same as 6 + 7 = 13)
Tip: When student writes number sentences, have him/her vary whether they are written vertically or horizontally.
Option 2: Give student 5 - 10 word problems (using things in their environment or Islamic themed) and have student write the number sentences to match; have student read the resulting number sentences and tell you which numbers are the addends and which are the sums.
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 18.
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.
Teacher Assessment:
Go to next lesson or not?
Decide whether you want to go on to lesson 3 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 3 and provide daily addition facts practice.
New Math Deck Cards to add: none
Review the cards already added
TJ Third Grade Math Lessons
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This page last updated:
Friday, May 09, 2008
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