Demonstration Lesson Plan in Math IV
I. Objectives:
A. Perform operation of addition or subtraction of dissimilar fractions. M4NS-IIg-83
B. Analyzes and solve word problem involving addition or subtraction of dissimilar
fractions.
C. Work cooperatively with the group and class activities.
II. Adding and or Subtracting Dissimilar Fractions
• Mathematics IV LM pp. 127 - 129
• Teachers Guide pp. 157 - 159
• K to 12 CG M4NS-IIg-83
• laptop, LCD projector, flash cards, cartolina
III. Activities
A. Preparatory Activities
1. Drill
Identify similar or dissimilar fractions.
• 3/4
2/3
1/5
• 1/2
2/6
2/3
• 3/7
4/7
5/7
• 5/9
1/9
2/9
• 1/10 6/10 8/10
2. Review
Adds or Subtracts similar fractions.
• 2/5 + 3/5 =
• 2/6 + 1/6 =
• 7/8 - 2/8 =
• 9/10 - 4/10 =
• 10/12 - 6/12 =
B. Developmental Activities
1. Motivation
Song : Math Dali (downloaded video)
2. Presentation
Ask: Can we add or subtract dissimilar fractions? How can we add or subtract
dissimilar fractions?
3. Discussion
Let the pupils watch downloaded video of math dali episode – Adding or Subtracting
Dissimilar Fractions.
4. Activity
Perform the indicated operation.
• 2/3 + 3/5 =
• 2/6 + 1/3 =
• 7/8 - 2/4 =
• 9/10 - 4/5 =
• 10/12 - 3/6 =
5. Generalization
How can we add or subtract dissimilar fractions?
6. Application
Read, analyze then solve.
1. Marie shared 1/4 slice of a cake to her friend. Her sister shared 3/8 slice of a cake
with her friends. How many slices of cakes did they share altogether?
2. Lando cut a bamboo stick which was 5/6 metre long. He used ¾ metre for a garden
peg. How many metre of bamboo stick was left?
IV. Evaluation
A. Solve for N.
1. 3/4 + 1/3 = N
2.
4/5 - 2/3 = N
B. Read, analyze then solve.
3. Tootsie spent 3/10 of an hour sweeping the yard and 2/5 of an hour watering the plants.
How long did she work?
4. Aling Mila cooked 8/10 kilogram of spaghetti. She gave 2/5 kilogram to her neighbors.
How much spaghetti was left for her children?
V. Agreement
Do Get Moving on Math LM pp. 129 - 130.
Wilson S. Parayaoan
Teacher III