1. Topic-
|
Fractions Unit - Adding and Subtracting Fractions with unlike denominators. |
|
|
2. Content-
|
|
3. Goals: Aims/Outcomes-
|
1.Students will be able to add and subtract fractions with unlike
denominators.
2.Use their learned skills to find the greatest common factor
3.Apply their learned skills to create fractions with like denominators.
|
|
|
4. Objectives-
|
1.Students will be able to perform the addition and subtraction
of like fractions.
2.Student will transition this skill to include unlike regular fractions
that round easily. |
|
|
5. Materials and Aids-
|
Overhead projector, pencils, notebooks, and calculators if necessary. |
|
|
6. Procedures/Methods-
|
A. Introduction-
1.
DO NOW: Students will review greatest common factor by doing a problem
to find the greatest common factor between two denominators. Good
afternoon class, today we are going to learn to apply what we learned
in the last couple of days about greatest common factor to our goal
for today which is to add and subtract fractions with unlike denominators.
Remember, when adding and subtracting fractions you must always always
have the same denominator! |
|
|
B. Development-
1.
will demonstrate the steps to adding or subtracting fractions with
unlike denominators: Here is our problem: 1/3 + 2/9. First can we
add these fractions the way they are... no, because the denominators
are not the same. Therefore, our first step is to find the GCF, which
we learned about. After going through the process, I found that the
GCF is 9. Now I must take that GCF and apply it to my fractions. What
that means is that we want each of the denominators to be 9 so that
the fractions will have like denominators and we can add the fractions.
When multiplying fractions one must do to the top what he does to
the bottom. With our first fraction 1/3 we had to multiply 3 by 3
to get to our 9. Therefore, we must multiply the top and bottom by
3 to get 3/9. For, the second fraction we need to multiply the fraction
2/9 by 1 to get a denominator of 9. Therefore, our second fractions
result is 2/9. We need to add the fractions, 3/9 + 2/9 which we can
do now because the denominators are the same, the answer is 5/9. Repeat
process for subtracting fractions. |
|
|
C. Practice-
1.Students will practice the process demonstrated with me by doing
a couple more problems. |
|
|
Accommodations (Differentiated Instruction)-
Students who need help find the GCF will use a calculator to assist
multiplication. |
|
|
Checking for understanding-
Students will complete an exit ticket of one subtraction and one
addition problem. |
|
|
Closure-
I will review the problems on the exit ticket after collecting the
paper.
|
|
|
7. Evaluation-
|
|
8. Teacher Reflection-
|
I will assess the exit ticket to come to an understanding of whether
or not the majority of my class understands adding and subtracting
fractions with unlike denominators. |
|
|