Lesson: Fractions: Adding and Subtracting Like Fractions
SWBAT find the sum or difference of fractions with like denominators.
Materials Needed: scrap paper for DN and GP, Example Like Denominator Chart, white board, dry erase markers, pencils, and IND Worksheet (two sided).
Vocabulary: whole (or ONE or unit), denominator, numerator, equivalent, sum, difference.
Do Now (3 -5 min): The teacher writes the following fractions on the board and has the students write two equivalent fractions for each.
3 = 4= 3 =
5 7 4
Opening (2 -3 min): Teacher quickly reviews answers to the Do Now. The teacher should then state the objective, “Yesterday, we found the whole of a fraction. Today, we are going to add and subtract like fractions. By the end of this lesson, you will be able to find the sum or difference of fractions with like denominators.”
Direct Instruction (8 – 10 min): The teacher has a chart that reads, “Fractions that have the same denominator are called like fractions. Fractions that have a different denominator are called unlike fractions.” The teacher reads the two sentences and then says, “Today we will be working with like fractions, so fractions that have the same denominator. I think most of you will find this to be very quick to pick up. There is only one rule that you have to remember. We never add the denominator because when we are adding like fractions we are working toward the whole!”
The teacher should then demonstrate using the first three problems on the Example Like Denominator Chart. The teacher should review counting out the whole to find the denominator of the fraction and the shaded part to find the numerator. The teacher should also call attention to the operation being used.
Guided Practice (10 min): The teacher uses more problems from the Example Like Denominator Chart to explain the concept of adding or subtracting fractions with like denominators.
See Example Like Denominator Chart
Independent (10 min): The teacher passes out the IND worksheet. The students should only complete both sides during the IND practice.
Closing (2-3 min): Teacher calls the attention of the students back toward the front of the class to quickly review the answers to the Independent Practice worksheet/ ask what we learned about.
|IND add fractions side 1 Classwork|
|Example Like Denominator Chart Exemplar|
|IND subtract fractions side 2 Classwork||